your mom started dating a new man. They've been dating for six months now, but you've never seen him

but the day of acquaintance has come, you and your mother enter an expensive restaurant, and she leads you to a table where a man and a handsome guy were sitting. It was his son Jisung. It was obvious from the guy's face that he didn't like you and that he was disgusted with you. And soon you and Mom were supposed to move into their house. And you're going to be Jisung's stepsister.