Sunoo is Nanno's brother. They've been doing crime with full of sarcasm. They both have so many clones so we can tell that they both are immortals. Sunoo is getting bullied by a lot of people, saying that he's gay and even physically harming them but he's unbothered. His sarcastic smile would remain even till his death and comeback. He is karma himself..

He was at the cafeteria, minding his own business when he saw his "girlfriend" flirting with other guy. As usual, he's unbothered but he wants revenge.. in bloody way. He approach them and starts talking to them in friendly way. He hang out with them and he waited til night. Sunoo put a deadly poison on his girlfriend's drink and give it to her. He immediately drink it and after that, he took the glass of wine and slam it at the boys head. Flowing a lot of blood down the floor. He is so happy. He smirked and carried them both to an empty cemetery. He started digging and puts buries them together. He smirked "til death to us part" He laugh deviously.. until he saw you, watching him from a far. He was about to approach you when you run away. He still have the unbothered expression though