Medical Examiner Dr. Qin (法医秦明)

Someone's dead in the well!

- Someone's dead! - The body was dumped in the well.

The victim is Xie Li Jun, 61 years old.

He was single and lived alone.

He has an older brother, Xie Li Guo.

His nose and mouth were covered and he died from mechanical asphyxiation.

Covering up the victim's face is just one purpose.

On the other end of the rope was a heavy object to weigh down the body.

Inform Lin Tao to keep fishing for the heavy object.

Judging from the width, these drag marks were made by the body.

The arms made the marks on the sides.

That means there's only one unsub.

Who played chess with Xie Li Jun that night?

The DNA results of the cigarette butts showed

that it was the informant, Zhao.

I curse him to have no offspring!

Zhao is still suspicious.

I suspect that he's lying.

Chief Qin, look.

There's nothing else in the well.

There are many small holes in it.

These are hand-pricked.

It's filled with little pebbles.

These pebbles are often used in construction.

They are often seen in house renovations or road works.

They don't just show up in fields.

Normally, murderers will use whatever is handy sink a body.

Are any roads under construction or houses being renovated near Zhao's place?

There aren't any near Zhao's.

But there's a new house being built 300 meters north of the victim's home.

We went past it when we went to the victim's place.

Which direction did you say the house is?

North of the victim's home.

300 meters.

North?

That's weird.

Are you police officers or not?

The real murderer is out there smirking

but you're keeping me in here! For what?

I'm just really down on my luck! Terrible luck!

A dead body was dumped in my well!

You arrested me?

We found your fingerprints and DNA in Xie Li Jun's home.

Please cooperate with our investigation.

How am I to cooperate with you?

There's a dead body in my well and that makes me a murderer?

Is this how you solve a case?

Are you a police officer?

Please calm down.

We won't wrongly accuse anyone.

Please calm down and cooperate with us.

Have some water.

I won't!

I feel so wronged!

Drink water?

Judging from Zhao's reaction

he's probably not the murderer.

But we still don't have any evidence to rule him out yet.

We can't release him.

He also admitted that on the night of murder

he did play chess with the victim.

But around 10 p.m., he headed back home to sleep.

According to our investigation

he hasn't behaved out of the norm recently.

We've overlooked something.

If it were a crime of passion that resulted from a game of chess

the murderer would have attacked in the spur of the moment.

But the autopsy showed that the victim was asleep when killed.

The murderer snuck in and attacked all of a sudden.

That doesn't fit with a crime of passion.

What's more...

We measured that from Zhao's well to the victim's home

it took us about 10 minutes to get there.

An adult can walk about 80 meters per minute.

It means that this distance is about 800 meters.

The pile of pebbles is 300 meters north of the victim's home.

If Zhao did kill Xie

he would have had to walk 800 meters from the south to the north first

to kill the victim and then walk 300 meters north to get the pebbles

before heading back to the well to dump Xie's body.

This route seems a bit off.

This behavioral logic does seem weird.

Which room do I sleep in?

Over there.

It's not that ideal to have men and women sleep in the same room.

What's not ideal about it?

It's good enough that we get a place to sleep.

I'm just concerned that you're at a disadvantage, okay?

You don't use pillows.

The last time we were investigating in a village

I used a pillow that hadn't been used for years

and I caught lice. I had to shave off all my hair.

- Didn't Qin go with you? - He did.

He spent all night studying the spawning of lice but he didn't warn me.

You weren't observant enough.

Baby. No, I'm investigating a case in a village.

The signal is weak. It isn't that I didn't want to answer your messages.

I'll talk to you over WeChat, okay?

Da Bao, we're at the tofu stall.

You're here to get some tofu, sir?

Da Bao, which one should we get?

This one.

It was for tofu?

Wake up quickly.

I have an idea that needs to be verified.

It's only 6 a.m.

Why do you wake up earlier than my mom?

Where's Qin Ming?

How would I know?

Let's get going. Hurry up.

Let's go! Quickly!

We're running late.

Quickly! Wake up! Get your clothes.

I thought that the holes in the plastic bag

weren't deliberately made by the murderer.

Think about this.

He dumped the body in the well and covered it up with twigs.

He must have been very nervous.

When someone is so nervous how could they remember

to poke holes in a plastic bag?

Isn't that Qin?

Qin, we found out where that plastic bag came from.

It's a bag that was used to pack tofu.

The murderer must have bought tofu recently.

Xie Li Jun didn't cook.

He wouldn't have bags like that.

The murderer must have prepared all the tools at home.

The bag, rope, and a vehicle.

He then packed pebbles on the way.

The pile of pebbles is 300 meters north of the victim's home.

That means that the murderer's home is also in the north.

Exactly. The murderer's home is north of the victim's.

He carried out the murder alone.

He recently bought tofu.

He has some sort of vehicle.

That's all the information we have now.

Look.

These twigs are in such small pieces.

If the vehicle was a motorcycle or an electric car

it would have been hard to tie these small twigs to a car.

Only a tricycle could transport the twigs easily from here to the well.

After this idea came to my mind

I came to check scene this morning.

Tracks left behind by a tricycle are unique.

Between the front wheel and the two rear wheels

they leave behind three tracks that are equally spaced.

It's even more obvious when it turns.

And that is a typical track left by a tricycle when it turns around.

We can make a match with the wheel pattern.

We now have the tracks of the vehicle

and the origin of the plastic bag.

Can we narrow down the investigation?

You're right. I'll get started on it.

We investigated based on the clues we currently have.

There are 27 households north of the victim's home.

There are 32 suspects that fit our profile.

We've also checked with the town's tofu stalls.

There are two stalls with the same kind of plastic bag.

The holes were all poked by the vendors.

They know their customers

since they are all regulars from the town.

Among these 32 suspects

11 of them bought tofu recently.

Of these 11 suspects, 7 of them own a tricycle.

However, we compared their tricycles to the tracks we found

and none match the pattern.

Which are the four suspects without tricycles?

The four are Xie Si Miao, Xie Feng Xie Li Guo, and Li Chu Qi.

We've been to their courtyards.

We didn't find any tricycles.

Did any of those four suspects throw away tricycles

or lend them to someone else?

We can't ask them that.

If we do, they will know what we're investigating.

But we're already comparing wheel tracks so they should know by now.

Do you have photos of these four suspects' courtyards?

We do.

Next.

Stop.

Whose house is this?

It's Xie Li Guo's house.

If he doesn't own a tricycle

why would he have a new tricycle handle?

Officers, what is the matter?

Sir.

Where is your vehicle?

What vehicle?

Your tricycle.

We don't have a tricycle.

I got that from elsewhere.

Madam!

May I borrow your tricycle?

Sure!

Didn't you take it out with you?

Why didn't you bring it home?

Sir.

Come with us.

- Is this the spot? - Yes.

This is the spot he told us.

Give me the shovel.