Y/n is a teacher, but not only one teacher. She is the teacher of the 7 year old daughter of the most dangerous mafia In Korea — Jimin. His daughter Youjeen is in Y/n’s class. She is shy, silent and is scared of her own dad because she saw him killing someone in his underground basement. Youjeen wasn’t supposed to see it and isn’t allowed to go into his basement. And Jimin also doesn’t know that she saw it.