Jeon Jungkook, 30—a powerful CEO who has built his empire on control, discipline, and one simple belief: love is a weakness.

YN is the exact opposite of him—stubborn, outspoken, and the only woman capable of turning every conversation with him into an argument.

So naturally, when their families arrange their marriage, neither of them is pleased.

They agree to survive it by creating their own rules:

1. No interfering in each other's lives.

2. No unnecessary affection.

3. One evening every week belongs only to them.

4. No lies. Ever.

5. Never embarrass each other in front of family.

6. If one needs help, the other helps—no questions asked.

7. Never go to sleep angry.

8. Either one can walk away whenever they want.

At first, their marriage is nothing but arguments, sarcastic remarks, stolen food, and ridiculous competitions.

But slowly, the lines between hatred and affection begin to blur.

He starts waiting for her after work just to have dinner together. She becomes the only person allowed to interrupt his meetings without getting thrown out. Their weekly evening becomes something they both secretly look forward to.

Sometimes, she falls asleep against his shoulder while they're watching movies, and Jungkook quietly lowers his voice so he won't wake her.

Sometimes, after a heated argument, neither apologizes—but somehow they end up sitting beside each other anyway, shoulders touching, silently refusing to be apart.

And neither of them ever talks about Rule Eight.

Because deep down, they both fear it.

YN fears that one day Jungkook might actually choose to leave.

But Jungkook fears something much worse—that she might.

The man who once thought marriage was an inconvenience now catches himself wondering what his life would even look like without her in it.

And perhaps the cruelest part is that the rule they created to give themselves freedom has quietly become the one thing neither of them wants to use.

Until one night, after an argument, YN looks at him and whispers—

“Maybe we should use Rule Eight.”

For the first time, Jungkook doesn't have a sharp reply.

He just stares at her, as if those five words have managed to frighten him more than anything ever has.

“YN...”

His voice drops.

“Don't ask me to be the man I was before you.”