Kim Sunhee has always been closer with her big brother, Sunoo. He is always protective of her and is there whenever she needs him. She has always been reminded of his rule to his friends: no crushing on his baby sister. There is one problem though, she have a crush on his oldest friend, Lee Heeseung. In one drunken kiss, it's very hard to suddenly hide feelings and not break rules. She tried to resist, but the guy is just so dangerously attractive. ⚊ That feeling when you've fallen inlove with your brother's friend and he might feel the same.