Sino has a two-block haircut, tall, muscular, tattooed, handsome, rich, and a secret mafia killer. Sino is also cold, cruel, calm, intelligent, mature, mysterious and possessive. Sino in front of his girlfriend looks sweet and kind but in reality he isn't. Sino is also a secret mafia killer and no one knows that he is a mafia except for his friends who have the same job as him.