Bang Yunha already has 18 ex-boyfriends and it's all thanks to her overprotective brother, Bang Minsoo aka CAP. 

The last thing she wants is falling for a playboy who apparently is her brother's best friend. And her brother disapprove of them dating even though it's his friend.

But Yunha can't stop this feeling inside of her. Will Yunha follow her brother's advice be a good sister or be a rebel and follow her heart?