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SOCIAL

SEX

SECRET

SEX LINE

S LINE

RED LINES THAT CONNECT SEXUAL PARTNERS

Why are you so slow?

You got this.

Hurry, Teach. We're going to be late.

Let's go!

Teach, we're going to go on ahead!

See you in a bit!

Kids, be careful. Don't get hurt.

I'm late.

Miss.

Here.

Silly me. How could I forget?

Thanks, Jun-seon.

Wait.

Hey, Prez.

What's for lunch today?

How would I know?

And also,

we're not even in the same class, why do you keep calling me "Prez"?

Who cares?

You've been the class president every year since middle school.

So, what's for lunch today?

Ugh, so annoying.

What? Tell me.

I don't know.

Tell me.

Dude, this guy's seriously messed in the head, you know?

Get lost, you idiot.

You too, get lost, jerk.

Why the hell are you starting this shit again?

Dude, what's your problem?

So pretty.

Hey.

Where should we go this weekend?

Wherever you want to go.

Okay.

Last year, 5.9% of adolescents experienced

sexual relations.

According to Statistics Korea, 3,096,947 people fall

under the adolescent demographic.

That would mean at least 170,000 of them have experienced

sexual relations.

Only 170 thousand?

THE ANIMAL KINGDOM

I CAN SEE THE SAME WORLD YOU SEE.

COME TO BANGJU HIGH SCHOOL.

GET LOST, DUMB BITCH

KANG SEON-A ONE DAY, I'LL TELL YOU HOW I FEEL

Hey, you drew her too pretty.

Make her look more like a loser.

THE CRAZIEST BITCH OF THE CENTURY

Seon-a is pissed. Oh, no.

"Dear Ji-won."

"Hey..."

"I'm sure you don't know who I am,"

"but I've liked you for a long time"

Hey, kids.

Kids.

Seon-a.

Even so, violence isn't the answer.

When you start the attack,

it makes it difficult for me to take your side.

I'm going to kill her.

What?

Miss.

I'd like to go home now.

BANGJU POLICE STATION PERSONAL DETAILS

PERSONAL DETAILS

Ji-uk, that was really screwed up.

What do you mean? What now?

You sent me off into that bastard's place and took forever to get back.

I almost died in there.

I swear it was an emergency. I'm sorry.

It looks like I have to write an official apology for shooting my gun.

If you shoot to save someone, you have to write an apology.

If you don't and protect the rights of the criminal,

the press eats you alive.

Either way, it feels like crap.

Then, why are you looking at that again?

We already caught the culprit.

Something's sketchy.

What?

I just don't understand why he killed them at all.

He had relations with all those women.

He was probably another crazy bastard who suffered from an inferiority complex.

He has a history of dating violence on his record.

That's why he worked at a private academy after leaving that high school.

That happened last year.

Why did he have to do this now?

Because it's hot?

This punk kept going on about salvation or whatever.

Are you sure he's not religious?

Yes, according to the people who knew him,

he actually kept his distance from religion.

A religious math teacher.

It just doesn't sound right.

ASSAILANT'S RESIDENCE (DWELLING, LIVING ROOM)

Lines?

What the...

What in the world is this?

Seon-a, did you eat?

Hey, where are you going this late?

What the...

What is all this?

Seon-a.

Hurry up and get in. I'll drop you off.

Unbelievable.

Hurry up.

I'm so tired of getting kimchi stew all the time.

It's kimchi stew every day.

Hurry up.

What the? She's a virgin?

The one that finishes lunch last...

That whore.

TEACHERS' LOUNGE

No way.

Quiet down.

We have a new student joining our class today.

Her name is Shin Hyeon-heup.

Hyeon-heup, do you want to introduce yourself?

Then, I hope you get along with your classmates.

If you have any questions, you can ask Jun-seon, the class president.

You can take that empty desk there.

Go on.

Everyone should get ready for fifth period.

Yes, Miss.

Why can't she talk?

Is she dumb?

THE BEST ENTRANCE EXAM EDUCATION LED BY THE BEST LECTURERS

OH JEONG-MIN, MATH

Glasses...

Glasses...

Sorry

Why are you in such a rush?

It's nothing.

Wanna catch up after work?

Sure, hit me up.

TEACHER'S OFFICE 1, EDUCATION PLANNING

Can I help you with something?

I'm Detective Han Ji-uk from Bangju Police Station.

I just had a few questions.

You're Seon-a's father, aren't you?

Not dad, but uncle.

No wonder. You do look young.

Seon-a has been having a difficult time recently.

I'm sure you're aware of it?

I was busy lately, so...

I'm sorry, I didn't take good care of her.

It's okay.

But I'm not here because of Seon-a today.

I'm here investigating a murder case.

A murder case?

Yes. I'm sure you're aware that a serial killer was caught recently

at Wanseong Apartments.

I unfortunately don't live in this town.

Then, are you familiar with the name, Mr. Oh Jeong-min?

He was a math teacher here up until last year.

Yes, I do know Mr. Oh.

No way.

Are you saying Mr. Oh is dead?

Yes. Not as a victim, as the assailant.

My goodness.

Are you saying Mr. Oh killed people?

So, the thing is... it might sound a bit strange,

but did Mr. Oh always wear glasses?

Glasses?

Yes.

I'm not sure.

I've never seen him wear them.

Have you lost your mind?

I don't have any money to give you.

Stop bothering me.

What's this?

Are you being reckless now?

Shit. Did you run out of things to be embarrassed about?

It's time for you to be embarrassed now.

What?

Why would I be embarrassed?

Tell me.

Why would I be embarrassed?

Stop it.

What's this now?

Are you two part of a duo?

What the fuck is this? Do you want to jump or something?

No. We should both jump.

Let go of me!

Someone, help me. Fuck!

Promise me.

Promise you won't bother either one of us.

Fine.

Let go of me!

Crazy bitch.

Hye-yeong, are you okay?

Why are you meddling?

Did I ask you for help?

Are you still mad at me?

Why would I be mad at you?

Just mind your own business.

Come on. Let's go.

Do you want to go see Seon-a before you go?

She should be done with class soon.

No. She'd freak out if she knew I was here.

Then, I guess I'll reach out if I remember anything.

Okay.

But...

- Your... - Yes?

Oh.

Why is this...

What the? Why was he here?

Excuse me.

I heard this man was a regular here. Do you remember seeing him?

Yes. What is this regarding?

I'm Detective Han Ji-uk from Bangju Police Station.

I'm in the middle of an investigation.

He was a regular here.

Although he hasn't been around recently.

Was there anything strange about him?

I'm not sure. He always came alone and quietly drank by himself.

But I did notice he started talking to himself a lot at some point.

I thought he was just drunk,

but he was perfectly fine when he left.

He talked to himself?

He just kept saying numbers.

I mean... he was

just counting numbers like, "One, two, three."

Then, eventually, he ended up fighting with another customer...

Twenty-five. Twenty-six. Twenty-seven. Shoot. Again.

One, two...

That guy seems a bit strange.

Excuse me.

Do you have something to say to me?

Wow. So damn many.

What are you saying?

Have you lost your damn mind?

Oh, and I think he wore glasses.

Thank you.

I can't believe there are still people who carry around notebooks.

It's cute.

Wait.

What's so cute about notebooks?

But why did you pretend like you didn't know me at school?

How could I with all those kids around?

MISEONG MOTEL

KANG SEON-A: ATTACHMENT 1 IMAGE

This crazy bitch.

What's wrong?

It's nothing.

I've been so tired lately,

my skin is a mess, isn't it?

Is it? No, it's not.

Teach.

What would you do if someone found out about us?

I'm not sure. What do you think?

Maybe, I'll run away with you!

What should I do?

MISEONG MOTEL

It seems like you forgot we're minors.

He'll be punished but not me, you dumb bitch.

Did you see the news yesterday?

A female teacher from Jeongil High was caught sleeping with a student.

The world is really going to hell. The teacher is definitely an issue,

but I honestly don't know what kids are thinking nowadays.

Since you're pretty, aren't there guys hitting on you all the time, teacher?

Don't say that. How vulgar.

Sir, that's sexual harassment.

Oh, is it?

I apologize.

It's okay.

It's fine if it's about a man, right?

Our Korean teacher is quite a looker as well.

Be careful. Don't get yourself mixed up with a weirdo and dragged down.

As if they'd ever be interested in an old man like me.

Let's go.

MESSAGE FROM UNKNOWN SENDER

Aren't you going to class, teacher?

Yeah, I should go.

PREPARE 20 MILLION WON

Will 20 million won be enough for a deposit?

I'm not sure.

I just want to escape from this godforsaken place.

Are you trying to move out? Why?

I don't know. I'm just sick of all of it.

This apartment, this town, the people in it...

It's not like I have a family. I'll have to live on my own eventually.

Isn't that detective your family?

Hey, how can an uncle be a family?

That man doesn't care about me anyway.

But at least, you have someone.

What about you? Do you think your mom is still alive?

I don't know.

Then again, she would've reached out if she were still alive.

Mom, Dad called me a pig again.

Jeez, why are you fighting over every meal?

Hey, Hye-yeong.

Are you going to continue sleeping in class

and leaving to go to the bathroom? Well?

Your behavior is rotten to the core.

What are you trying to do here?

What was that earlier?

Were you just out to get me?

Do you know anything? Is someone threatening you?

Oh, you got the pic. That was from Kang Seon-a.

Kang Seon-a?

The Kang Seon-a in your class?

How does she know about us? Did you tell her?

How would I know?

I'm a victim, too. Don't take it out on me. This is bullshit.

Kim Hye-yeong!

Your way of talking to the teacher, what's up with that?

Teacher. I sincerely apologize.

I should get to class now.

Asshole.

How could Kang Seon-a...

But seriously, how did she find out?

What picture? Where was it taken?

I told you to be careful!

What do you think you're doing?

What?

"What?" How can you say that right now?

You're going to break up with me to hang out with that bitch?

Oh, were we dating?

Hey!

Are you saying I told someone?

You did. That's why I received these photos.

Why would I? You must have.

You must have thought it to mention it.

Are you sure you didn't say anything?

Lower your voice. We're at school.

Did you get drunk and go around telling people?

Have you lost your mind?

Those glasses...

What?

Did you always wear them?

My eyes have gone bad.

What are you doing? Give them back.

You can see something with these on, can't you?

What are you talking about?

Red lines.

Can you see them, too?

Then, how many lines do I have on my head?

One.

Choi Da-hye has five.

Kim Hye-yeong has two, one with the Korean teacher.

Choi I-seul has over ten.

The gym teacher is having an affair. Shall I continue?

How?

Where did you get these glasses from?

I just found them.

That's the truth. They were in my locker.

Give them back.

These are dangerous.

How can glasses be dangerous?

You know what happened to your neighbor recently, right?

That man was wearing these glasses.

He saw the S lines.

S lines? Oh, so that's what they're called.

So what?

I couldn't care less about who made them

or who it originally belonged to

These are mine.

Hey, Teach.

Yes?

You have a Seon-a in your class, don't you? A Kang Seon-a?

Yes, I do. Why do you ask?

What's she like?

She hasn't been behaving in my class recently...

Oh, really?

She hasn't had any issues recently.

Do you want me to talk to her?

Oh, really?

No, it's fine. I'll try talking to her.

Okay.

You're looking at my S line, aren't you?

I'm not.

But do you know how to get rid of them?

Not sure.

Maybe the partner just needs to die?

Are you going to hold onto those glasses?

Of course.

I'm going to show them how pitiful they really are.

PREPARE 20 MILLION WON

Is it your first time?

No.

Are you okay?

I HAVE THE 20 MILLION WON. MEET ME ON THE SCHOOL ROOFTOP AT MIDNIGHT.

Who is it?

My financier.

Where do you want to go?

What?

What about coin karaoke?

PHOTO BOOTH

What are you doing?

That's not going to work.

Let's check out over there.

What's that?

They're mine.

So you should just keep your mouth shut, too.

What's with that face?

The ones on top came out really nice.

Damn it!

What's wrong?

What the?

Excuse me, did you find a pair of glasses over there, by chance?

Hello?

It's you, isn't it? You took them!

What are you talking about?

My glasses! They're gone!

Glasses? What are you talking about?

Damn it. I'm late.

Where are you right now?

I have to get to school right now. I'll talk to you later.

School? Why are you going to school at this hour?

Hello? Hey!

BANGJU HIGH SCHOOL

I haven't been on the roof in a while.

But how did you know it was me?

Oh. Hye-yeong must have told you.

Nobody saw you come up here, right?

What's the point of asking that?

Where's the money?

You shouldn't live your life like that.

All of a sudden?

Then, should I be more like you?

You were an outcast anyway, right?

Not anymore.

Please, Seon-a. I have a child. My second will be born soon.

What will my family do if I get fired from here?

And where would I suddenly get 20 million from on a teacher's salary?

You people all knew that I was getting bullied,

by Kim Hye-yeong and Choi I-seul.

But, you guys just ignored it.

All because of Choi I-seul's parents.

Seon-a, let me apologize to you on behalf of everyone. I mean it.

Don't be ridiculous.

Seon-a, then how about this?

Let's just delete that photo on your phone first.

Then, I'll get you that money some way, somehow tomorrow.

WIFE

EXPLAIN THIS.

HOW COULD YOU DO THIS TO ME?

You sent it?

You sent it already?

What are you talking about?

Why?

Why?

Seon-a.

You must be looking for evidence.

Who are you?

I'm Lee Gyeong-jin from Class 5.

So you think it was a suicide attempt?

Do you happen to know who these belong to?

Try them on. I bet they suit you.

I heard you almost got married. What happened?

not long before the wedding,

saw her in bed with my friend.

Having it happen before the wedding

is the best luck you can get.

If you found out

someone you knew was having an affair,

what would you do?

I'd let everybody know

and let all hell break loose.

RED LINES THAT CONNECT SEXUAL PARTNERS