Original subtitles

Aren't you a forensic?

What brings you to our squad?

What's your connections to the Raw Diamond case?

None.

Then why'd you show up at the trading spot?

Answer me!

Why did you come here?

Not just me.

Anyone here,

and even anyone Lanzi might

have met after she left,

could be the killer.

We're gonna check

every suspect.

But right now, you're our prime suspect.

In the autopsy report,

was there any

erosive bleeding?

Or any foreign objects in Lanzi's stomach?

Please go ahead.

You've got a person dead from cyanide poisoning,

but you can't

figure out when or where

the poison got slipped to her?

It means

the poison was already in her body.

You mean there's no killer?

Qiu Lanzi poisoned and killed herself?

You found my fingerprints

on that bottle of water.

But it's because

that one wasn't for Lanzi.

Ms. Zhu!

Ms. Zhu,

what did Mr. Qi say?

He thinks the cyanide

was already in Qiu Lanzi's body.

How did he know?

The report was turned in just now.

Have you heard of

remote case-solving?

It's to find out the truth

by analyzing crime scenes

and examining bodies without physical presence.

Only a few forensic doctors can do this,

and Qi Sizhe is one of them.

Gao Yuan.

Check the stuff he used in the lab.

Then compare them with that bottle of water.

Okay.

I go with you.

Did you transfer here

because of what happened before?

You followed Jiang Fei,

went to the bar,

and visited Li Yiqi in the hospital.

What do you wanna do?

I've told you.

That's not truth.

Han Feng.

You really think

I'd kill a forensic intern

I just met?

You know very well

it couldn't be me.

What I think matters not.

Figuring out the truth matters.

Since he's helping with the case,

maybe you could clue him in

on some of the stuff we've dug up,

just enough to

speed things along

and catch the killer faster.

Okay.

Mr. Gao.

Please test Mr. Qi's water

and effervescent tablets.

Tell us what you find out.

Okay.

Thank you.

Mr. Han. Ms. Zhu.

The results come out.

The report shows

each of their saliva

in the other's water.

So Qiu Lanzi took his water by mistake.

Yes.

The water Lanzi drank

should be Mr. Qi's soda water.

And in Mr. Qi's bag

was just mineral water.

Okay.

Gotta go.

Mr. Han. Ms. Zhu.

I've sure you've known why

my fingerprints were on that bottle of water.

I wanna know why you said

the cyanide was already

in Qiu Lanzi's body.

I think Lanzi was usually on meds.

We did find some stomach meds in her bag.

What meds?

Omeprazole.

What else did the autopsy find?

Found two drug capsules in her stomach.

The shells looked melted,

and one of them had cracked open.

Last question.

How many pills are left in her medicine bottle?

Just one.

I think I know

how Lanzi was murdered.

Lanzi's stomach med,

omeprazole, is an enteric-coated capsule.

It's designed to pass through

the stomach without breaking down in the acid,

then get absorbed

in the intestines where things are more alkaline.

However,

it was found in her stomach.

Why?

Qiu Lanzi took your water by mistake.

It was soda water,

making the capsule dissolve quicker.

The coating on the capsules is slow-release,

so they should start working within

4 to 12 hours.

But she drank soda,

and that cut the time

way short.

So the cyanide

was hidden in Lanzi's

stomach med capsules.

One of the two capsules in her stomach

had cracked open.

The killer must've noticed it too

when slipping cyanide

into the capsules.

Once the capsule coating

gets partly dissolved by the soda,

the cyanide inside

comes into contact with the stomach lining.

The corrosive poison will definitely

cause erosive bleeding in there.

How to prove it?

There's still one pill left in her medicine bottle.

Su.

I'm sorry, Ms. Zhao.

The cooperation with He City is about to end,

and you're going abroad.

Sorry we have to call you back.

It's fine.

I'll be there if you need me.

So what happened?

What do you want me to check?

Mr. Qi figured

the victim might take

omeprazole capsules laced with cyanide,

but then drank soda by accident.

That made

the capsule dissolve in the stomach

instead of the intestines.

We've found

the capsules in her stomach.

So we need you here

to test one last pill

in the victim's

medicine bottle.

I got this.

Thank you.

How is it?

Ms. Zhao is testing the pill.

It needs some time.

Cross-check all the evidence

and don't miss any details.

I'll wait here.

Okay.

The dosage of omeprazole is

three pills a day,

one in the morning and two in the evening.

If the killer wanted to

make sure Lanzi died

that very night,

he must've made certain

at least

one of the two pills

she took was poisoned.

If he only poisoned one pill,

Lanzi might not take it

until the second morning.

That's a one-in-three chance.

But if he poisoned three pills,

then there'd always be

one poisoned pill left

as evidence.

So,

poisoning exactly

two pills

was the sweet spot.

But if Qiu Lanzi

took both the poisoned ones,

we couldn't find anything

in the left one as evidence.

She's got a one-in-three chance of

swallowing both poisoned pills,

which means

the killer only has that same shot at

not leaving evidence in the medicine.

So we're just gambling on the last one.

We've got the result.

The pill indeed contains cyanide,

same as Mr. Qi supposed.

Mr. Qi, you're off the hook for now.

You can go.

Ms. Zhu.

I wanna help with the case

and find out Lanzi's murderer.

And,

something's off with Jiang Fei's

autopsy report.

I'm afraid you gotta stay outta

Jiang Fei and Qiu Lanzi's case.

I wanna see Jiang Fei's autopsy report.

You're not the only forensic here.

You don't gotta handle every single case.

Come in.

Mr. Bai.

Qi Sizhe is off the hook now?

Yes.

And he found out how Qiu Lanzi died?

Qi Sizhe is a brilliant forensic doctor.

And he's quite reasonable.

So he won't

blame you for the necessity of

your interrogation of him.

Mr. Bai.

Do you know about his past?

He had a severe car accident.

And I thought we'd lose

a talented forensic doctor.

But I never thought

he'd manage to hit rehab milestones

in just a year that usually

take others three to five years.

You can imagine

how much this position means to him.

But he's quite stubborn.

So is Han Feng.

Among you three,

you're the calmest and most rational one.

So I hope you can

get them together

and handle cases.

Where's Xi?

I had her check 788 Bar's security footage.

I still have some doubts.

We found the cyanide

in Qiu Lanzi's stomach meds.

The killer could

get close to her

and switch her meds.

So it could be someone

she knew all along.

Qiu Lanzi said something was off

with Jiang Fei's body.

Ask Mr. Gao to

check his autopsy report again.

Su.

Dig deeper into

the social circles around

Qiu Lanzi, Jiang Fei, and Li Yiqi,

especially Qiu Lanzi's connections.

Okay.

Mr. Han.

Anything to add?

Nothing, for now.

Xi, got anything?

Yeah.

Half a month before Li Yiqi's case,

Mr. Qi showed up

at 788 Bar quite a few times.

I cross-checked a few security footages.

Every time Mr. Qi showed up,

Jiang Fei was there too.

Looks like

Mr. Qi was following Jiang Fei.

Ms. Zhu.

Here's Qi Sizhe's info.

He had a severe

accident two years ago.

A woman riding in his car

died on the spot.

Ms. Zhu.

Anything wrong with him?

Get back to work.

Yes.

Why did you come?

Why did you follow Li Yiqi and Jiang Fei?

You know why.

'Cause it's related to Fei's death.

Raw Diamond...

You came for the Raw Diamond case.

Jiang Fei's death isn't an accident.

It's a murder.

His body was found

at 11:30 or so

in the morning.

It's the same as room temperature,

22 degrees.

He's got these

little square marks on his chest,

bright red.

And the lividity on the side of the body is all patchy,

dark red.

Any problems?

The bright red lividity

doesn't match the estimated time

of death,

and the body's cooling rate is way off.

There are two possibilities.

First,

the killer was trying to mess with

the time of death.

Second,

the way the murder was done

messed with the body's temperature.

And I think

the second one's way more likely.

So my guess is,

Jiang Fei probably...

Froze to death?

At his own home?

But his place

doesn't have such an environment.

There is one.

No way.

It's too small.

If the killer stuffed Jiang Fei

into the fridge,

there gotta be

a lot of scratches and marks

on Jiang Fei's body.

But so far,

there aren't any

such marks on the body.

Only lividity.

Lividity is the marks formed by blood

due to gravity at the dripping points.

Jiang Fei was lying on his side

when he died.

So,

the lividity should only have formed on the side.

But look here.

There are bright red marks

on Jiang Fei's chest.

Also, when Jiang Fei died,

his clothes were all wrinkled.

His clothes look like they got wet

and then dried off...

His fingers and toes were

all wrinkled,

a result of

prolonged soaking in water

and osmosis.

Jiang Fei was

always a slob,

so it's no wonder his clothes were wrinkled.

When we found the body,

there was water at the bottom of the bathtub.

The wrinkles on his skin were

probably caused by soaking in the water.

Well, going by your logic,

his fingers and toes shouldn't

have gotten wrinkly

since they haven't touched

the water at the bottom of the tub.

But turns out that's not what happened.

So Jiang Fei didn't

freeze to death in a freezer,

but in the...

In the bathtub.

The window in

Jiang Fei's bathroom

has always been open.

When the body was found,

the ice had already melted,

but there were frostbite

marks on the body.

The bright red mark

on his chest is

the best proof.

This is also caused by

the failure of

various organs at low temperatures.

Judging from the traces at the scene,

everything matches

what Mr. Qi said.

Got it.

Han Feng.

Are you buying

that Jiang Fei's death wasn't an accident

but murder now?

If Mr. Qi's reasoning

holds up,

we gotta check this place

for any signs of

a second person.

Search more thoroughly.

I wanna learn more from you

and become a great forensic doctor like you!

Ms. Zhu.

Any progress

in Jiang Fei's case?

You've been cleared of suspicion.

So why still look into Jiang Fei?

I know you're really concerned about Jiang Fei's case

and Li Yiqi's case.

I also know

you can lead us closer to the truth.

But so far,

you haven't explained

the coincidences of your appearance

in these two cases.

And this time,

why did you go to investigate Jiang Fei alone?

I want you to answer my question.

And I'm not gonna answer any questions

related to this case

until I trust you.

Ms. Zhu.

I'm a forensic doctor.

When someone dies,

only forensic doctors can tell what they

went through before they died.

And I believe

whoever it is,

even drug dealers like Jiang Fei,

they all deserve the truth.

I saw the possibility

of homicide in Jiang Fei's case.

So I gotta figure out the truth.

But he's quite stubborn.

So is Han Feng.

So I hope you can

get them together

and handle cases.

So Jiang Fei died

a little after 4 am?

Yes.

If he froze to death,

his body temperature

was lower than normal.

So the time it takes to cool down

would be shorter.

Mr. Han.

Mr. Qi inferred

that Jiang Fei froze to death.

Let him tell us about it.

All we know is

that Jiang Fei

was frozen to death by the killer,

but there aren't any clues

to find the killer.

The killer made Jiang Fei

take cephalosporin

when he was drunk,

causing a disulfiram-like reaction.

Then, when he was unconscious,

the killer froze his body with ice,

which led to the failure of all his

internal organs, especially his heart, and he died.

It shows that the killer has some knowledge

human physiology.

Mr. Gao,

after the first autopsy and test,

what was in his stomach

as food residue?

Wine and sausage,

no cephalosporin.

But the cephalosporin on his table

was already opened,

and the pharmacological test detected it.

The sausage wasn't digested,

which means the last thing

the victim ate was

the sausage.

Have you found a knife there?

No.

There are cuts on the sausage

but no knife around.

Could someone have taken it?

Jiang Fei's body didn't have

a scratch on it.

The knife couldn't be the murder weapon.

So why'd the killer take it away?

Did you guys do luminol

at the scene?

There are no cuts on the body,

but the killer had to take the knife

from the scene.

That means...

The knife wasn't used on the victim.

But on the killer.

If this isn't Jiang Fei's blood,

then it gotta be the killer's.

Why didn't you ask Mr. Qi to

do the bloodstain comparison?

The results are out.

No records matching in the database.

Thank you.

So here's the timeline of these cases.

On the evening of the 7th,

Qiu Lanzi joined us investigating

the 788 Bar assault case.

Then she teamed up with Mr. Gao and Mr. Qi

for the Li Yiqi's

blood sample analysis

until the next day.

We found

Jiang Fei's body at noon the next day,

and Qiu Lanzi showed up later.

That night, she, Mr. Qi and Mr. Gao

dissected Jiang Fei's body.

We found the remains of stomach meds

in Qiu Lanzi's stomach.

Based on the dissolution rate of the meds

and the timeline,

Qiu Lanzi should've taken the stomach meds

between the time

after the dissection of Jiang Fei's body

and her death.

The first time Qiu Lanzi left the station

and met me

was around 9 pm.

Two hours later,

I got a call from Qiu Lanzi.

She said she'd

found a lead on Jiang Fei's body.

Ten minutes later,

when Mr. Han and I got to the forensic office,

we found her body.

The stomach medicine was found among

her belongings.

She usually kept her stuff

in the locker in the changing room.

Got anything from the surveillance over there?

No cameras on the floor.

There are just people going to and from work there.

And Mr. Bai means we shouldn't

expand the investigation for now.

He wants us to narrow down the suspects first.

So the most likely time

for Qiu Lanzi to take the pills is

between the time

she left the station and came back.

We just don't know

where she went and who she met.

What about Jiang Fei?

Don't forget

Qiu Lanzi said she had info about

Jiang Fei's cause of death before she died.

Jiang Fei went home after getting drunk.

Where did he drink

and who did he drink with?

Have you found out?

He didn't use mobile payment or cards.

He always used cash,

so it's hard to find his consumption records.

People like him are always

afraid of leaving any clues.

Wan,

let's go to the bar to check

Jiang Fei's movements before he drank.

Xi,

go and find out

who Qiu Lanzi met

after she left the station.

Let's split up.

Okay.

Do as Mr. Han says.

It's here, Mr. Han.

No, Mr. Han...

You're in charge here?

This is legit business.

Legit business?

Then why so serious,

needing a guide to find here?

Oh, come on!

This is a gimmick.

More people will wanna come in

if they need someone to bring them in.

That's smart.

Since it's so complicated to get here,

you should know who came here

the day before yesterday, right?

Sir.

How the heck can I remember

all these guests every day?

Take us to the security room.

Sir.

You need a warrant to do so.

A warrant, huh?

I'm gonna call my buddies

from Public Security Brigade

and let them check it out.

Sir.

You can check whatever you want.

We checked Jiang Fei's social circles.

Super complicated.

He's lived in cities all over the country.

A drug dealer like him's gonna

have a lot of enemies.

If we just look at the motives for murder,

there are a bunch of suspects.

Here's

his hidden ledger we found.

There are up to 40 drug addicts listed in it,

not to mention those

who bought imitation guns, plasma, and illegal drugs.

Ms. Zhu.

This is Qiu Lanzi's phone.

Got anything?

I checked Qiu Lanzi's call records.

After she left at 9 o'clock,

she made four consecutive calls within five minutes,

and they were all to the same person.

Who?

It's a chemical factory's lab.

But it was off-work time then,

and she called the switchboard,

so we still can't find out who she contacted.

We gotta find out what relationship

this factory has with Qiu Lanzi.

Okay.

Ms. Zhu.

Have you checked Qiu Lanzi's phone?

Xi just gave it to me.

I watched the videos

of Qiu Lanzi before and after she left here.

She never stopped checking her phone.

I remembered that Mr. Han told me

when he saw Qiu Lanzi that day,

she was also anxiously checking her phone.

There must be some clues on her phone.

She just didn't

have time to tell us then.

Stop.

Who's the girl drinking

with Jiang Fei?

Jiang Fei had introduced her to us.

Zhang Lu, I remember.

She's into Lolita fashion,

close to Jiang Fei.

She took photos of Jiang Fei's body?

But phones are forbidden in the dissection room...

Maybe she had some reason.

Check out these last three photos.

The first two

are of the tattoo on Jiang Fei's arm,

one taken without a black light,

and the other with a black light.

And the last one

is of the skin on his wrist.

Also, the first two were taken at the same time.

But there's a gap of over 20 minutes before the last one.

Why did she wait over 20 minutes to

take a photo of the skin on the wrist

without a black light?

What did she find out?

I saw some illegal stuff

in the bar near Ruixi Building.

I just saw it when working.

It's fine. You're welcome.

Treat me to dinner then.

Wan.

Thank you.

It's nothing.

Ms. Zhu asked me

to investigate with you.

No need to say that.

I saw Qiu Lanzi taking

those photos,

but I just glanced and left.

I was in the next room with Ms. Zhao

taking samples

for toxicology testing.

If you also left,

then Lanzi was the only one left in the autopsy room.

But when she was taking the photos,

she asked me what this was.

What is this?

It should be an old injury

or a mark left after having a tattoo removed.

No.

It seems to be a fluorescent tattoo.

There are two photos of the tattoo on the left forearm,

one in natural color

and the other under a black light.

If we follow the logic of the previous two photos,

there should be

another black-light photo.

There are lots of group photos

of Jiang Fei with different girls on his phone,

and one of them is

Zhang Lu, the girl we've been looking for.

Zhang Lu, 24 years old,

living in Xinhua Road, He City,

an intern researcher at an inorganic chemistry institute,

majored in chemistry.

She knows Qiu Lanzi.

They were high school classmates,

so they rented an room

and were roommates shortly.

In the call records we retrieved,

the last call Qiu Lanzi made

was to Zhang Lu's workplace.

You said you saw Zhang Lu

and Qiu Lanzi arguing that day, right?

Yeah.

I did see them arguing.

But I didn't catch what

they were arguing about.

When I left,

I saw that girl wasn't feeling well

and took some medicine.

Are you sure Qiu Lanzi took medicine at that time?

I'm sure.

Where's Zhang Lu?

Mr. Han.

We've been searching for her

with your info.

Excuse me.

Your ID card and driving license please.

Please open your trunk.

You're Zhang Lu, right?

Zhang Lu.

Please cooperate with us.

Zhang Lu, 24 years old.

A researcher of the chemistry institute

in He City.

Were you at the basement bar

in Yunjin Building with Jiang Fei

on the evening of

August 7th?

Yeah.

Then did you go home with him?

No.

I just had a few drinks

and went back to my own place.

Is there anyone who can prove it?

Prove it? Why?

I live alone.

How can there be a witness?

So no one can prove

you stayed at

your own place that night.

What was Jiang Fei's state when you

saw him for the last time?

He...

He seemed to catch cold.

You're out

drinking with a cold?

Do you even know that mixing antibiotics with alcohol

could kill you?

But I just really wanted to

have a drink with you.

How'd you hurt your finger?

Cut it during

an experiment.

What did Qiu Lanzi say

when she came to the lab?

What'd she tell you guys?

Isn't she interning here?

Call her over!

I'll confront her!

Qiu Lanzi's dead.

Did you kill her?

Dead...

How... How come...

Zhang Lu,

now we suspect

you're the prime suspect in the murder cases

of Qiu Lanzi and Jiang Fei.

Got anything to say?

If Zhang Lu's blood sample

matches the one we took

from Jiang Fei's place,

she's most likely

the killer.

I didn't!

I never killed anyone!

I didn't... I really didn't!

Then just answer

our questions!

What did she say to you?

She...

She told me

Jiang Fei was dead,

and she saw my name

on the body...

How is it?

Wait a moment.

Ms. Zhu.

The result is out.

Mr. Han.

It matches.

Su.

Arrest her.

Xi, untie her.

It's her.

No...

Not me!

I didn't kill them!

I didn't!

It's not me!

It's really not me!

I never killed anyone!

It's not me!

I didn't!

Don't arrest me!

Please!

It's not me!

You got

the wrong person!

It's not me!

Not me!

Really not!

I didn't kill them!

You got the wrong person!

It's not me!

Not me!

We got the wrong person.

It's not her.

Raw Diamond case is over!

You just can't deal with reality!

You never figured out Fei's death!

Li Yiqi. Jiang Fei.

They're the clue from the case!

Hey! Stop!

There's an opening here.

The kidnapped girl was

probably taken inside.

The killer set this up

to throw us off

about the cause of death.

He knows way too much about

forensic,

autopsies, even our

police procedures.

Wait, are you saying...

The killer is one of us?