Killua is very handsome and has a lot of money, he even has a mansion that is like a castle.Killua works as a hitman but no one knows about his job, not even his own daughter named Kiana.Kiana is the daughter of Killua and his first wife who died and now Killua can't fall in love anymore but Kiana asks her new mother to look after and care for her,Killua is always busy with his assassin work so he has no time for Kiana,Kiana feels lonely.Kiana is 5 years old now.And Killua is 27 years old.