Heeseung is a mafia boss. There are many other mafia gangs and one of them is your family you are the daughter of a mafia boss. Another diamond has appeared in the city which the mafia gangs are collecting. Everyone has heard about the red diamond and wants to get it, it is in the house of a billionaire in the city. Today, you are sent on a mission and from the other gang, Heeseung goes on a mission. You're in the billionaire's house and waiting for him to go to sleep.