"What? You suddenly want to marry me?"

You have a half-sister who always wants everything you have, so when you have a boyfriend, your sister steals your boyfriend because she doesn't accept it. You want revenge on your sister and your ex. That's the reason you suddenly want to marry Hwan.

"So... you want to marry me for revenge, huh?"

"Yes, I will do my best. I will act as a good wife and of course I will not expect your love. We will only pretend in front of society."