Partners for Justice 2 (Investigation Couple 2 / Gumbeobnamnyeo 2 / 검법남녀 시즌2)

The deceased is a 41-year-old man named Jang Ho Gu.

His car ran into the median strip...

by the entrance under the Mapoong Bridge.

He got married only a year ago,

and his wife also died in a car accident today.

Article 997 of the Civil Law says...

one can receive the inheritance as soon as the other party dies.

My sister is the first person who can claim his inheritance.

Yet they're treating us like we're con artists.

Why don't we ask the NFS to conduct autopsies...

to find out the exact time of death?

Therefore, Jang Ho Gu's time of death is...

is 7:37am.

What about Cha Joo Hee's?

We cannot rule out...

that Cha Joo Hee was murdered.

Pardon?

It's a homicide case now.

What on earth are you saying?

My Joo Hee was murdered?

When we went to inspect the scene of the accident,

we didn't find any skid marks on the road.

It's just as I thought.

There are no skid marks.

How is that important?

She didn't step on the brakes.

Because she didn't slow down when she crashed,

it caused fractures in her cervical spine and a whiplash injury.

On the day of the accident, it was cloudy.

But the concentration of the fine dust was 30 microseconds.

She was more than 200m away from the truck.

If she was watching the road ahead,

she would've stepped on the brakes as soon as she saw the truck.

Why did she not hit the brakes then?

There are 2 possibilities. The 1st one is...

that she was unconscious.

During the autopsy,

we found food remnant in her throat which means she vomited.

I found food remnant in her throat.

Vomiting is one of common symptoms...

before losing one's consciousness.

The second one is that something was wrong with her eyesight.

We found retinal detachment in the deceased's eyes.

When your retina separates, you'll lose your eyesight.

Is that why you extracted her eyes?

Then, which one is it?

It's both. - We found the substance...

that can cause both in Cha Joo Hee's blood.

Which part are we supposed to read?

Darn it. - It's right here.

Right here. We found toxic gas in her system.

That one. N2O.

Pardon? - It's nitrous oxide.

Nitrous oxide.

When it goes into a body,

it causes hallucination, headaches, and vomiting.

Ocular hypertension causes retinal detachment and hypoxia...

which can lead to loss of consciousness.

The cause of death is the brain damage from the car accident.

But the cause of the accident is the loss of consciousness...

due to the acute poisoning of nitrous oxide.

As for the type of death,

we cannot rule out that she was murdered.

By the way, what's nitrous oxide exactly?

It's for general anesthesia.

It's mostly used in the OR or at the dentists.

And her sister, Cha Do Hee,

is a dental hygienist who gets 1,400 dollars a month.

Forget Tahitian pearls. She couldn't even buy a simple ring.

Now, this case has become a homicide case now.

All of the family members who are present here today...

are important, relevant individuals of this case.

Or suspects even.

And Ms. Cha Do Hee.

Yes? - You work at a dentist, correct?

What are you saying? - You fabricated the time of death.

And on top of that, you have...

access to the nitrous oxide which was the murder weapon.

As of this moment,

you've become a suspect of this case.

I will arrest you now since you may try to destroy evidence and flee.

Right away. - Wait!

Wait. You can't do this. - What do you mean she's arrested?

What are you talking about? Why are you arresting her?

Why would she kill my daughter?

What do you think you're doing? - Wait.

Hold on. - You can't do this!

I thought it was a dispute over inheritance,

but it's a murder case now.

We will investigate thoroughly...

and catch the murderer who killed your daughter-in-law.

As you should.

I doubt she'll have money for a decent lawyer.

You can't do this. Wait!

Please cooperate.

You didn't make any mistakes, correct?

What are you implying?

Mom, did you...

Stop the car. - Okay.

I want you to...

Make sure you don't leave...

The murder weapon of this case is nitrous oxide which is unheard of.

The killer wanted a perfect crime by causing a car accident...

and planned a very elaborate murder.

The culprit is very meticulous...

and has a strong agenda.

The culprit probably carefully planned this for a long time.

And the culprit almost fooled us.

In a nutshell, it means this case is that much harder to crack.

We'll start again from square one and check everything.

Let's start. - Yes, sir.

Victim, Cha Joo Hee. Age, 27.

She used to be a flight attendant.

She's been a housewife for a year.

He also died on the same day.

Her husband, Jang Ho Gu. Age, 41.

He runs a cafe in a building that he owns.

All right. The first suspect is...

Cha Do Hee, the victim's sister. She's a dental hygienist.

She's a clever woman...

who thought about inheriting her sister's assets...

when her sister had just died in the ER...

and fabricated the time of death for this purpose.

As you all know, she can easily obtain nitrous oxide with her job.

The more I think about it, the scarier this sounds.

She went after her sister's money as soon as her sister died.

That's right. I get why she'd do that.

She's about to get married with Im Jong Min.

She took out money from the savings accounts, had a line of credit,

and gathered every cent she had left.

She literally used up all of her money.

No wonder why she was so greedy over money.

There might've been bad blood between her and her sister...

regarding the inheritance.

What? Settle?

I guess you took a liking...

into that apartment worth four million dollars.

Ho Gu said he'll give it to us...

But here's a thing.

Since a woman from a poor family married into a wealthy family,

she'd be like the golden goose of the family if I'm being blunt.

To the girl's family, this marriage would mean a fortune.

I can't think of any reasons why she'd want to kill her sister.

We're talking about nitrous oxide here.

You need expert knowledge to use the gas to kill someone.

Listen. Once we start digging at the dental clinic,

we'll definitely find a lead.

I'll dig until there's nothing left to dig.

You've got the wrong place.

This case is so obvious.

It's 1 of the 3. Love, money, or grudge.

This case has money written all over it.

Yes, money.

The girl's family is dirt poor.

It's a problem when you don't have money,

but it's also a problem when you have too much.

All right. The second suspect is...

the victim's brother-in-law, Jang Ho Chul.

He ran a car tuning business three years ago which went under.

After his mother paid off the debts, he had to move back in with her.

He's managing her buildings and gets paid 2,000 dollars.

What good is it when his family is rich?

In fact, he doesn't have any assets. He's also dirt poor.

His mother gave his brother an apartment and a building...

when his mother totally neglected him?

This sounds more like it.

Besides, he would be benefitting the most from this accident.

It's just him and his brother.

Since his brother and his sister-in-law died,

he will be the only one who would qualify...

to inherit his mother's assets.

That's only possible because both of them died, correct?

That's right. That's the point.

To Ho Chul, I bet his brother was his biggest obstacle.

But didn't the NFS say...

it was a simple car accident caused by his negligence?

We can't be sure of that yet.

Where is the vehicle now?

Since it's a simple car accident, we didn't impound it yet.

Issue search and seizure warrants for both vehicles.

Have the NFS inspect the cars. - Yes, sir.

I'll look into Jang Ho Chul's alibi and whereabouts.

And I'll look into Cha Do Hee.

I'll start with the color of her poo on the day of the incident.

I'm going to get to the bottom of it.

There's more.

What? - What do you mean?

The third suspect is...

the mother-in-law, Cheon Chun Ja.

She has 5 to 6 buildings and tens of studios in Gangnam.

She has 5 to 6 buildings and tens of studios in Gangnam.

The value of her total assets comes out to 50 million dollars.

She's a rich lady with good assets.

It seemed to me that she wouldn't talk to her in-laws.

Exactly. The economic difference between them is too great.

The girl's family is about to get kicked out for failing to pay rent.

And their in-law is this rich lady with real estate properties...

that's worth millions of dollars.

To people like her, marriage is a business deal too.

I bet she disapproved of the girl.