My mother’s words didn’t surprise me.

That was how she had always lived.

Endure first. Question later.

But I suddenly didn’t want her marriage to become the blueprint for mine.

—Mom, I’m not asking permission.

She went silent.

—I’m informing you.

I ended the call.

That night, Co Hoai didn’t return.

The next morning, I contacted a lawyer.

I had expected divorce to be complicated.

Instead, the first thing she asked was simple:

—Who owns the apartment?

—Both of us.

—Who paid the down payment?

—I paid seventy percent.

She nodded.

—Then gather every bank statement, receipt and property document you have.

So I did.

While searching through our financial records, I noticed something strange.

There were dozens of restaurant charges near our home on nights Co Hoai claimed he was working overtime.

Hotel parking fees.

Weekend purchases.

And repeated transfers to Lam Duyet.

Not huge amounts.

Just small enough that someone who “never asked questions” wouldn’t notice.

That someone had been me.

By evening, I had printed everything.

Co Hoai finally came home around nine.

Lam Duyet was with him.

Again.

I almost admired the audacity.

Co Hoai tossed his keys onto the table.

—Have you calmed down?

—Completely.

He nodded as though he had won.

—Good. Then apologize to Lam Duyet. Yesterday you embarrassed her.

I looked at him.

—Why is she here?

—To clear up the misunderstanding.

Lam Duyet gave me a gentle smile.

—Giang Niem, I really don’t want to affect your marriage.

I nodded.

—Perfect.

I placed two documents on the table.

—Then you arrived at exactly the right time.

Co Hoai frowned.

—What’s this?

—Divorce agreement.

His expression changed.

—You’re still talking about that?

—I’m not talking anymore.

I pushed a pen toward him.

—I’m doing it.

Lam Duyet immediately lowered her eyes.

But I saw the tiny movement at the corner of her mouth.

She was pleased.

So I added:

—And before either of you leaves tonight, delete your fingerprint from my door.

Her smile disappeared.

Co Hoai slammed his hand onto the table.

—This is my house too!

—Exactly.

I opened another folder.

—That’s why my lawyer will handle the property division.

He stared at me.

—Lawyer?

Apparently, that word finally made everything real.

Then his phone rang.

He looked at the screen.

Lam Duyet’s expression instantly changed.

—Don’t answer.

Too late.

Co Hoai glanced at her.

—Why shouldn’t I?

I watched them carefully.

Something passed between them.

Fear.

Not embarrassment.

Fear.

Co Hoai rejected the call.

Seconds later, my phone vibrated.

Unknown number.

A message appeared.

“Mrs. Co, you don’t know me, but before you divorce your husband, you need to check who has actually been paying for Ms. Lam’s apartment.”

I read it twice.

Then looked at Lam Duyet.

—Do you own an apartment?

Her face went white.

Co Hoai turned toward her.

—What is she talking about?

Interesting.

He didn’t know either.

I showed him the message.

Lam Duyet immediately grabbed her bag.

—Someone is trying to cause trouble. I should go.

I stepped away from the door.

—Of course.

For once, I had no interest in stopping her.

But Co Hoai did.

—Wait.

He stared at her.

—What apartment?

—It’s my family’s.

—Your parents rent their home.

She froze.

That was the first moment I realized their relationship wasn’t as simple as I had assumed.

And neither of them knew the whole truth about the other.

The next morning, my lawyer helped me organize the financial records.

The mysterious message had given us an address.

The apartment wasn’t registered to Lam Duyet.

It belonged to a small company.

And one of the people connected to that company was Co Hoai’s department director.

The same married director Co Hoai had praised for years.

Suddenly, the fingerprint on my door looked almost insignificant.

Why had Lam Duyet needed unrestricted access to our home?

Why had she been comfortable taking my belongings?

And why had Co Hoai been so determined to normalize her presence?

Three days later, I received the answer.

Not from Co Hoai.

From his company.

An internal investigation had begun.

Several confidential documents had disappeared over the previous six months.

Access records showed that Co Hoai had downloaded some of them.

He swore he hadn’t.

Then security footage showed Lam Duyet repeatedly using his work computer while he was away from his desk.

When Co Hoai came home that evening, he looked destroyed.

—Giang Niem…

I was packing the last box of my belongings.

—She used me.

I continued folding my clothes.

—That’s unfortunate.

—She only stayed close to me because she needed access to company information.

I finally looked at him.

—And why did she need access to our house?

He couldn’t answer.

I picked up my suitcase.

He stepped in front of me.

—I made a mistake. But nothing happened between us. Can’t we start over?

I stared at the man who had called me unreasonable for objecting to another woman’s fingerprint being registered at our home.

—You still don’t understand why I’m leaving.

—Then explain it.

I shook my head.

—I spent a year respecting your boundaries.

—You spent that year teaching me that mine didn’t matter.

I walked past him.

Before leaving, I stopped at the fingerprint lock.

My fingerprint was still registered.

Lam Duyet’s had finally been deleted.

But it didn’t matter anymore.

I removed mine too.

Co Hoai stared at the lock.

—What are you doing?

I picked up my suitcase.

—Making things convenient.

His face stiffened.

I smiled.

—Now neither woman has a reason to come back.

Then I closed the door.

The divorce took several months.

Co Hoai kept insisting everything had begun because of one fingerprint and one lipstick.

He was wrong.

Those things hadn’t destroyed our marriage.

They had simply shown me what my marriage already was.

And the strangest part?

Months later, when the company’s investigation finally revealed who had instructed Lam Duyet to obtain those confidential files, Co Hoai called me eleven times.

I never answered.

Because by then, I had learned the lesson he should have understood the first time I walked out:

A door doesn’t become yours because you know how to open it.

And a person doesn’t belong to you simply because you assumed they would never leave.