it's a story about how six boys from korea found themselves working with the most dangerous,scariest and richest king of mafia called "nightfall" who trained and love them with his twins a boy and a girl just like the age of the 6 boys(teenagers)but the outcome was crazy when the king of mafia was betrayed and killed by his gangs through crackstone order a man who owned the largest gold and diamond companies,but the 6 boys and his twins stood up for his death and work along with themselves for revenge while Kim nam joon took after his father's place......find out more in the book and trust me you'll love it