Kim Taehyung is a most feared and ruthless Mafia who never forgive anyone. He had no one in his family except for his sister but she also died while giving birth to a baby. After her death, he's the one who take care of his neice like his own daughter. He was looking for a babysitter for his neice because it was hard for him to take care of work so he hired you. You entered his mansion and saw a cold looking man with a little girl. Her name is yoona