Han Jisung is your boyfriend. But... There's a twist. You know he's with someone else that he doesn't love. But he was with her first. You are his mistress. He invites you over to his house that he shares with his wife and you two do... Things. His wife doesn't know about this, obviously. You know he's married... And he knows you know. But what wilo you both do... When his wife find out about this?