Original subtitles

ALL CHARACTERS, PLACES, ORGANIZATIONS, EVENTS, GROUPS,

AND SETTINGS ARE FICTITIOUS, AND CHILD SAFETY GUIDELINES WERE FOLLOWED

BASED ON THE NOVEL THE DAY OF KIDNAPPING BY JEONG HAE-YEON

Go to the monitor room in the basement.

There's a landline phone that can't be traced.

Dad used to make calls on it.

THIS IS KIM MYEONG-JUN...

RESTRICTED NUMBER

Hello?

This is Kim Myeong-jun.

Mr. Kim Myeong-jun?

I'm the kidnapper.

I have...

Ro-hee.

Please go on.

I'm calling to negotiate.

Negotiate?

Are you with her right now?

If you want to find her,

you'll need to prepare some money.

Thirty billion won.

Hello? Are you listening?

Yes, please go on.

If you care about her safety,

liquidate all Ro-hee's family's assets--

Let me ask you again.

Are you with her right now?

Yes.

No! She's not with me.

Let me speak to her.

What do I do?

What do we do?

It's been a while, Mr. Choi.

No, I should call you Attorney Choi, right?

Are you okay?

You sound fine.

I'm doing okay for a dead person.

But isn't this too obvious?

I'm talking about your clients.

I'm not sure.

This negotiation tactic

doesn't seem very wise either.

That's why I need your help.

Tell my great-uncle

that my kidnapper demanded ransom.

He'd better pay up,

or else I'll tell the world that I'm still alive.

What do I gain?

CHAPTER 7. THE MOLE

Breaking news.

Along with the witness who claimed to have seen

Choi Ro-hee's body being thrown into the sea,

the police force is searching the waters

with more than a dozen divers.

But with the strong currents

and the fact that it's the maritime boundary between China

are expected to cause difficulties in the search.

Kim, the captain who witnessed the scene,

is fully cooperating with the investigation.

Also, until the child's body is found,

he will provide his boat free of charge

and lead the police to the expected area where the body was thrown.

We will come back with more updates.

I wired 300 million won to all the crew members.

All right. Let's go get ours now.

By the way, is he trustworthy?

Who is he?

He used to be my homeschool teacher,

and he's an attorney now.

He's still on probation, but still.

Also, do you really think I can trust someone right now?

I trust no one.

Does that include me?

I can't trust you for another reason.

What reason? What is it?

What's the reason?

Seriously.

But we're together.

How will we get the money?

Dr. Mo will help.

How do we trust her?

When Dad first started this project,

he didn't do it for money.

So he only received investments

from those who shared the same vision as him.

Jaden, who only considers this as part of making big money,

and Dr. Mo are different.

I'd be of help to Dr. Mo,

so she should help me too.

We still have some time left. Why are you handing over the case?

Keep it down, will you?

You think I want to hand it over?

What?

This is from the highest of the higher-ups.

How do you expect me to go against their orders?

No press conference.

End the case as quietly as possible.

No.

Park Sang-yun.

Kim Myeong-jun threw Choi Ro-hee into the sea.

And the captain witnessed it!

How do we trust a single witness's statement?

Then do you believe a kidnapper's statement?

Park Sang-yun.

Don't get all touchy over this.

It'll only cause us trouble.

Let's stick to our jobs, okay?

Let's wrap up the murder case

and get ourselves promoted, okay?

What is it?

Ms. Seo Hye-eun is here.

What?

Hey, Sang-yun!

Hey, you...

We're handing over the kidnapping case, so get the paperwork ready.

-Sir. -Come on.

Hurry up!

Hello.

I'm sorry.

I couldn't take your calls due to personal engagements.

You've seen the news about the murder, right?

Mr. Park Cheol-won

has been arrested as a suspect in the murder of Dr. Choi Jin-tae.

I have some questions regarding your relationship with him

so I called you in as a witness.

It's about you and him

since that day, 30 years ago.

I found out while looking into the case of Mr. Park Cheol-won and Dr. Choi Dong-eok.

Back then, Dr. Choi had an adopted daughter.

Where do you want me to begin?

Since the day he terminated my adoption?

Or...

since the day...

I got this scar?

-No! -My goodness!

Nurse!

I was shocked.

But I couldn't even cry.

It's okay. You'll be fine.

I was worried he might disown me for crying.

I held in my tears until the very end.

But even after the scar healed,

they didn't let me go home.

I was stuck there for about a year.

I later found out

that the scalpel Cheol-won used to slash me

was used to operate on an AIDS patient

and the fact that

I was infected with AIDS.

Despite all this,

my dad, the leading authority in gene therapy,

poured his heart and soul...

into treating me.

On the day I came home after treatment,

a boy that I'd never seen before

was in my room.

Who are you?

Me?

Park Jin...

I mean, Choi Jin-tae.

Who are you?

But...

if Dr. Choi poured his heart and soul to help you get better,

why did he disown you?

I...

didn't meet his expectations.

Dad, no...

Dr. Choi was conducting an experiment he devoted all his life to,

but I didn't show the results...

he wanted.

An experiment?

Do you really think Choi Jin-tae and I

are the only ones Dr. Choi adopted?

Sorry?

I mean...

I'm amazed by the fact that you were able to find me.

I'm sure there weren't any records.

Officially, Choi Jin-tae is the only one he adopted.

But there are other kids...

who were adopted and disowned, just like me.

What do you mean?

Why would he repeatedly adopt and disown the kids?

He wanted...

to amplify the brain's functions through medical technology.

Did he conduct that experiment on the children he adopted?

All the kids who didn't show progress were disowned,

including me.

Then does that mean Choi Ro-hee is also the victim of that experiment?

I don't know.

Do you really think he would've continued

such a cruel experiment until now?

Was Mr. Park Cheol-won aware of these facts?

This isn't something you can share.

I only kept this to myself.

Then tell me.

When did you meet Mr. Park again?

Cheol-won always felt sorry for me

because he thought I was disowned because of him.

I also blamed him.

Whenever I wanted to take it out on someone,

he always appeared.

He must've wanted repentance.

He sent me donations

until I graduated high school.

Have you kept in touch with him since then?

After I graduated,

I thought our relationship was finally over.

But...

the nightmare...

returned.

3 YEARS AGO

EXAMINATION RESULTS

HIV ANTIBODY

When I found out my HIV had relapsed,

I hated

and resented everything,

even my daughter.

When I was about to let everything go,

I heard a familiar name

on the news.

Dr. Choi Dong-eok, the pioneer of gene therapy in Korea,

has passed away at the age of 83.

He devoted his life to gene therapy

and helped Korean medical technology to take a big step forward.

The Korean Medical Association expressed their condolences on their website

and stated a great star has fallen.

His relatives said that he passed away peacefully

without any illness or pain.

OUR DEEPEST CONDOLENCES

I don't know why I went there.

I just thought...

he was the first person I called "Dad,"

so I only intended to say my final goodbye.

Hye-eun.

But coincidentally, I met him there...

again.

I'm sorry.

That's how my relationship with him...

started again.

How will I repent my sins?

Then...

did he take charge of the security

at Mr. Choi Jin-tae's house because of you?

Do you think...

he did that because of me?

On the day he disabled the CCTVs in Mr. Choi's house,

Mr. Park broke into his house

and murdered him while attempting to commit robbery.

Have you contacted Mr. Park since then?

He hasn't contacted me in a while.

And I never contacted him first.

What about Mr. Kim Myeong-jun?

The next day,

Mr. Kim kidnapped Choi Ro-hee, who was running out of the house.

And after being on the run with the kid for some time,

he threw her body

into the sea near the maritime boundary

last night.

That can't be.

That can't be true. I can't believe it.

Oh, no.

Goodness.

Myeong-jun would never do that.

Myeong-jun...

isn't the type of person to kill someone,

especially kids.

It can't be true.

There must be something wrong.

Did you play a role

in kidnapping Choi Ro-hee?

No.

Where were you

on the 20th and 21st, the day of the incident?

I was...

at the hospital...

for a clinical trial...

of the new medicine for AIDS.

Three people died and a child was kidnapped.

I ask for your further cooperation.

If it's something I can help you with, then sure.

One more thing.

If Dr. Choi Jin-tae continued Dr. Choi Dong-eok's experiment,

would Mr. Kim Myeong-jun know

that Choi Ro-hee was a subject of that experiment?

I'm not sure.

If I'm being frank,

Mr. Kim shows different characteristics from normal kidnappers.

He protects and worries for the victim

and even requests help for her.

And if I'm being more frank,

I don't believe that he kidnapped Choi Ro-hee.

Neither do I.

The evidence of child abuse the nurse found on Choi Ro-hee last time

wasn't caused by Kim Myeong-jun.

She was being experimented on by her dad, Dr. Choi Jin-tae.

STATEMENT

This experiment has been going on since Dr. Choi Dong-eok

for the past 30 years.

NAME: SEO HYE-EUN

So?

What does that have to do with this murder case?

Are you saying Park Cheol-won took revenge on her behalf or something?

I'm talking about the kidnapping, not the murder.

Come on, Park Sang-yun!

Let me dig deeper into this.

This isn't a crime committed for money.

He has no one to demand money from.

Then what is he after?

I think Kim Myeong-jun...

is being used.

By whom?

We'll have to find out.

Who are you?

I'm Dr. Choi Jin-tae's uncle.

This is a murder scene, so you cannot enter.

I said I'm Dr. Choi Jin-tae's uncle!

I told you that you cannot enter.

What are you saying?

Hello, sir.

I received the call.

Please enter.

Just as we promised, you can have this house,

but all the research materials are mine.

What are you looking for?

It must be worth more than Dr. Choi's assets.

I'm not sure.

Life is about making bets.

I don't know if it'll be 120 billion won or 1 200 won.

Go ahead.

Yes.

What?

What on earth are you saying?

Okay.

Are you sure?

They took the computer as well.

Okay.

All right.

Look.

Get out of this house.

What the hell are you saying?

Get out right now!

He wants me to liquidate 30 billion won?

Yes, sir.

If you don't adhere to his demands, he'll upload the evidence

that Ro-hee is alive on social media.

Did you record the call?

No, sir.

Wait.

Why did he call you?

I was Ro-hee's homeschool teacher until last year.

He called me

after seeing that our law firm represents Chairman Choi.

Ro-hee remembers my number.

But why 30 billion won?

The late Dr. Choi Jin-tae's savings are presumed to be around 30 billion won.

He most likely asked for the said amount since that's the amount you can liquidate.

How could you take care of things like this?

What will you do now?

Do you even know where Ro-hee is?

The kidnapper called you himself?

-Yes. -What was his voice like?

Quite calm.

And it was a woman.

A woman? You said the kidnapper is a man.

And that's what the news said!

The one I spoke to was a woman.

Interesting.

Listen,

Attorney Choi.

Is it true?

What is?

The kidnapper who called you.

Was it really a woman?

Yes.

It was a woman.

Damn it.

I can't read your expression.

A woman with a calm voice.

A woman?

It's been revealed on the news that it's a man.

You think he'll believe that?

We'll have to see

whether he believes you or not.

If this goes well,

you'll be my legal representative

and appointed as guardian of my estate.

That sounds burdensome.

Are the police showing any movements?

Not yet, sir.

But there's a piece of information we've overlooked.

It's about Kim Myeong-jun.

SUSPECT OF YOUNGIN HOSPITAL DIRECTOR AND WIFE MURDER CASE ARRESTED

Is the Internet back on?

Yes.

I enabled tethering on Dr. Mo's phone earlier.

What?

What if you get caught?

I'm sure she noticed already.

But seeing how she hasn't turned it off,

I guess we silently agreed to leave it on.

Goodness, whatever.

Why are things so complicated?

You know, they say,

"You can never know

what a person is really planning."

You mean, "You can never know what a person is really thinking."

Whatever. Same thing.

Anyway, did you look up everything you wanted?

No.

I read the articles hoping that I remember something,

but I got nothing.

Remember what?

If I see something once, I never forget it.

But it took me a long time to remember the siren lights.

You recovered most of your memory.

That's true.

But my memory from that day isn't coming back to me.

There were two drugs my so-called dad injected during the experiments.

One stimulates the hippocampus,

and the other relaxes the body.

I always felt the same after I woke up.

And I always remembered what happened before the experiment.

But not this time.

I've never had a case where my memory was hazy.

I think...

another type of drug was injected into my body that day,

looking at how hazy my memory is.

But...

isn't it a good thing not to remember bad memories?

Usually, the most painful memories last the longest.

You scare me whenever you say stuff like that.

Why?

My greatest fear is people who become weird all of a sudden.

My greatest fear is you.

Goodness.

Anyway,

I'm hungry.

Aren't they going to feed us?

I've heard this line somewhere.

You're not imitating me, are you?

I am.

This is new. You hate skipping meals.

I don't know.

I don't have an appetite these days.

Maybe it's because my useless memories are back.

It should be about 8 p.m.

Yes.

Eat this if you're hungry.

Did you know I was listening in on you?

I thought you might be listening.

And...

that you might know I looked through your phone.

Just assumptions.

You know

that the moment I go to Singapore with Jaden,

your daughter won't be part of this project anymore.

That doesn't mean I can stop you from going.

Without Dr. Choi,

Jaden holds the most shares of this project.

You don't want me to go with Jaden, do you?

Ro-hee.

Do you think I can trust you right now?

I don't trust you either.

But what else can I do?

We only have each other to trust right now.

For the sake of both you and me,

isn't the solution to all this having my memories fully recovered?

Are your memories all back?

Only I can confirm...

whether I have regained them or not.

What a way to make an entrance, you bastards.

What are you doing?

Get up.

I should've asked this sooner.

Who are you?

Don't you know me?

My name is Kim Myeong-jun, you bastard.

Jaden!

Ro-hee, no.

Let me ask you again.

Is there an accomplice in this kidnapping case?

What?

I should've taken care of this earlier.

Your ex-wife went to the police today.

A woman demanded ransom before she was investigated.

So what?

I was stuck here all day

without a phone or a way to communicate.

So why are you taking this out on me, you crazy bastard?!

It was in the basement.

You son of a bitch!

Did you call him?

Or did you tell Seo Hye-eun to demand money?

What the hell are you saying?

She's behind all this, and you're just her pawn, right?

I did all this by myself.

Happy?

Seo Hye-eun was acquainted with Dr. Choi's murderer for a long time.

She knew all about the project since Dr. Choi Dong-eok's time.

Were you after Choi Ro-hee as well?

Is that why you killed them?

Is this true?

I don't know about the murder,

but I'm the one who planned, kidnapped her,

-and-- -Cut the bullshit!

Hye-eun has nothing to do with this.

I did this all by myself.

I'm asking this for the last time.

Did Seo Hye-eun tell you to do this?

Why are you keeping quiet like an idiot?

Stay quiet, Ro-hee.

She told him to do it.

Ro-hee!

Shut up.

Do you want a bullet through your head?

Look at his face.

He won't think twice about shooting you.

All right. Then let's have the genius girl talk.

You think this stupid man did all this?

His wife, who ran away years ago, suggested he should kidnap me

to make money for his daughter's surgery.

That's why he had no choice but to kidnap me.

But when things got complicated, she backed out.

Stop it!

I told you

she needs to look after Hee-ae!

Then you want me to stay quiet when you're about to die?

Quiet!

What if the person who demanded the money

was Seo Hye-eun?

You...

Don't you dare touch Hye-eun.

I won't let it slide.

Mr. Kidnapper.

It won't be suspicious

for you to die at any moment.

Don't act tough unless you want to die.

I won't let anyone who interferes with my business off easily.

Acquainted with?

What kind of acquaintance?

The murderer and the lady.

I really don't know.

She's known him for 30 years since she was young.

They've known each other far longer than I've been alive.

How could you not know?

The security company worker is in his fifties.

Maybe they had an affair.

Are you serious?

It's strange

that the security company worker and your wife are acquainted.

But how did he know?

What do you mean?

He knew about Hye-eun's questioning.

That crazy bastard even knew the details of it.

There must be a mole.

That might be for the best.

If the cops have their eyes on the lady, they can't harm her.

Where are you going?

Do I have to be held captive too?

I mean, you have a family, so you should go home.

Was your daughter's name Byeol?

Don't you dare say her name.

It may seem like we have different goals,

but in the end, our goals will align.

If you succeed, I'll make money,

and you'll be able to make your daughter healthy.

Byeol should become like Ro-hee.

But not an orphan.

She should be a girl with a happy family.

Hello.

How was today?

Good.

I'll get going then.

-Thank you for your work. -Goodbye.

It's Seo Hye-eun.

Hold on.

-It's the cops. -What?

That black van.

Damn it.

-Ju-hyeok. -Sir, Ms. Seo is going to work.

You bored?

It's only the first day, so I'm fine.

The longer you endure, the better results you'll get.

Keep up the good work.

Okay.

There's surprisingly a lot of people here still.

This is the only big hospital in the area.

Was there anything odd about Dr. Yoon recently?

Not recently.

He was just as usual.

What was he like usually?

Just a bit talkative.

Talkative?

I don't want to talk badly about the deceased,

but he was quite talkative.

What do you mean by that?

He liked to gossip.

Talking behind people's backs and things along those lines.

So he wasn't well-received by the employees here.

She's right.

In the end, no one wanted to hang out with him,

so he always waited for that security company worker

and would smoke and have coffee together.

What were the topics of his gossip?

There were so many.

He'd talk about a failed blind date of another person

or a secret affair between a doctor and nurse.

Things like that.

Anything else you'd like to add?

He also gossiped about Dr. Choi.

He said Dr. Choi was having trouble with his wife

and that he was having an affair.

But we didn't believe him. After all, it was Dr. Choi.

She's right.

Hello, this is Attorney Choi Taek-gyun.

Any progress?

The kidnapper sent me a video.

Keep a close eye on Kim Myeong-jun and Seo Hye-eun.

Yes, sir.

Dr. Mo Eun-sun as well.

I'm probably better than you at this scrape-the-sand game.

You shouldn't call this a game when it's this boring.

I'm getting sleepy.

It is indeed a great time to nap.

I think it's around 2 p.m.

Hey!

This is from last night.

Where is this?

A safe place that no one knows.

How can someone take this video if no one knows?

Sir.

Just sit back if you don't want to get bitten by a crazy bastard.

I'll take care of it.

How did they send this?

Through email.

I looked into it,

and it's a pornography website email serviced in Eastern Europe.

They're quite meticulous,

looking at how they used an email we can't trace.

-Next patient. -Yes.

The doctor will see you.

Dr. Mo is meeting with patients.

Is that why?

You should try to relax more.

Sir, Ms. Seo came outside.

I'll go. I was about to go to the bathroom anyway.

Seo Hye-eun disappeared behind the building.

There are cops nearby.

Don't cause a scene and find her.

Yes, sir.

Seo Hye-eun disappeared.

Damn it.

INTERNATIONAL CALL

SPEAKER

Hello?

This is Choi Taek-gyun. Go ahead and speak.

Is everyone there?

Well...

Yes, we're all here. Go on.

I called to tell you the location and the time to drop off the money.

You're demanding 30 billion won for an 11-year-old girl?

Isn't that too much?

I'm sure you know better than me that 30 billion won is cheap

considering her value.

If you fill up a 100L trash bag

with 50 000-won bills, it'll be 1.5 billion won.

There are five trash disposal areas

in Singil-ro between Ujeong Supermarket and the alley.

Place four bags in each area,

20 trash bags total.

You have until midnight tomorrow.

It's impossible

to withdraw 30 billion won in cash by that time.

That's none of my business.

We found Seo Hye-eun.

What about Ro-hee?

How will we make the exchange?

Who are you?

May I see your phone?

I said who are you?

Goodness.

After I check the amount, I'll drop her off in front of her house.

Could you let us through?

Excuse me.

Are we breaking off the deal?

Why aren't you talking?

Shall we stop here?

This is interesting.

No, I was just thinking

what you would do...

if I don't accept your demand.

Let me send you a link via email.

SENDER: UNKNOWN

THE KIDNAPPED RO-HEE IS ALIVE. VIDEO OF RO-HEE LAST NIGHT!

"Ro-hee's Great-uncle attempted

to fabricate her death."

Of course, I'm sure you're the one who bribed the captain.

"Why is X Capital, a private equity fund in Singapore,

so obsessed with this girl?"

People would get curious.

I'm sure 30 billion won is a cheap price to pay

to settle the impending backlash.

Hurry up and decide.

The views are going up.

VIEWS: 4

Okay.

THE VIDEO CANNOT BE PLAYED

Are you with Choi Ro-hee right now?

Great-uncle!

-Please help me! -What's going on?

-Please save me! -What on earth are you doing?

Let go of me!

Where's Ro-hee?

He's with Kim Myeong-jun.

Let me go!

Great-uncle!

Great-uncle!

Let me go!

Great-uncle!

Please help me!

I'll call you after I check the money.

Do you feel better?

You're getting pretty good.

It's getting fun.

Why can't you do your job?

I did everything you asked of me.

I convinced the higher-ups

and impeded the investigation.

You mess this up after taking advantage of me?

How will you take care of this?

We even told the public that she's dead!

How will you clean this mess up?

Mr. Choi.

As you said, the public thinks she's dead,

so we have to take care of this no matter what.

Getting upset won't get us anywhere.

We should put our heads together and think.

All meaningful fruition goes through adversities and--

You arrogant bastard.

How dare you patronize me?

Who the hell do you think you are?

Call the press and tell them she's alive.

Yes, sir.

No, I'll meet the chief of police myself.

I understand.

Take a seat, sir.

Please calm yourself first.

What the hell do you think you're doing?

You fucking nasty old geezer!

Who do you think you are to teach me?

Hey, I told you I'll take care of it!

I'll give you everything you want.

So let's cut the bullshit

and think about how to liquidate 30 billion won by tomorrow.

Let's put

our heads together, okay?

You fucking old geezer.

Let me search you first.

Goodness.

Jeez, I've got nothing.

Gosh.

I'll see you at dinner.

You can't leave the room today.

Why not? You won't feed me?

It's the director's orders.

I'll give you lunch boxes.

What? Lunch boxes?

Jeez, they treated me better back in prison.

Lock the door.

I got some money from the CEO of a private equity fund in Hong Kong.

I went to great lengths to get this money,

so can you trust me now?

Let me ask you one thing.

Are you sure...

you have Choi Ro-hee?

I'm not sure.

What will you do if things go wrong?

I never bet on something I'd lose on.

But I promise you this.

If things go wrong,

I'll bring Choi Ro-hee's body to you.

Ms. Seo came home at 9:20 p.m.

Yes, sir.

"Ms. Seo came home at 9:20 p.m."

We'll take turns sleeping. I'll sleep first.

Yes, sir.

Did she meet anyone in particular?

I don't know if she's caught on, but she only goes to work and home.

Gosh, I guess she doesn't even have friends.

How did she seem?

Calm.

I think she's shocked due to Park Cheol-won's murder

and Kim Myeong-jun's kidnapping.

Sir, there's a black sedan at my 11 o'clock.

-Tailing us? -Yes, sir.

I saw them yesterday afternoon.

They've been tailing Ms. Seo since yesterday.

Did you look up the vehicle?

It's an unlicensed car. I was about to arrest them but didn't.

I'll keep an eye on them for now.

Give this to Mr. Kim.

I have no appetite.

He eats two portions a meal.

Why?

You think I poisoned the food?

Try it then.

What? I get an extra?

That's good. I wasn't full.

You're fattening me up!

YOUNGIN POLICE STATION LIEUTENANT PARK SANG-YUN

Kim Myeong-jun is locked up in his room.

We're constantly checking in.

And Seo Hye-eun returned home.

What about Dr. Mo?

She went home after work.

She'll be coming to the villa tomorrow.

Gather all our men at the villa.

Capture that kidnapper

at all costs.

Would it be okay to reduce the number of men guarding Kim Myeong-jun?

What's the point of having guns?

Shoot him if things go awry.

Dr. Mo Eun-sun.

GARBAGE DISPOSAL VEHICLE

He's moving to area three.

Block the truck in front of area four.

Yes, sir.

Area four, block the truck.

Get ready to leave.

What's the noise?

Open the door.

Kim Myeong-jun, don't do anything stupid.

Ro-hee.

Get out.

Get out, you bastard!

I finally found you, you damn mole.

Stop.

Get out.

Get out, you bastard!

Drop your weapon.

I'm a cop.

You think getting rid of me will be the end of this?

Is this the right thing to do?

Things might get more dangerous for Ro-hee.

Ro-hee isn't a subject of an experiment anymore.

What are you doing?!

The warrant was rejected.

Today is Kim Myeong-jun's daughter's surgery.

I'll make sure to bring them in today.

I'll end everything today.

Where's Choi Ro-hee?

Mom!

Where are they?

What is Choi Ro-hee to you?

Why are you throwing yourself to protect her?

Ro-hee will live as an ordinary 11-year-old girl.

That's the only thing I can do as her kidnapper.

No!

Ro-hee!

Subtitle: Jea-heon Chung