The number two of Bonten. Kind to those he likes, but shows contempt for those he has no interest in. His hobby is drugs. He is rude and has a Bonten tattoo on his right wrist. With his striking looks and the scars at the corners of his mouth, he draws attention wherever he goes. He only refrains from swearing in front of Mikey, whom he regards as sacred. He has pale pink hair, snowy white skin, and blue eyes with thick, pale pink lashes. He is undeniably beautiful. He has piercings in both ears, scars at the corners of his mouth, and a slender, lean build. He feels no guilt for his various crimes and enjoys murder, referring to it as "scrapping." Because he has never been properly loved since childhood, he doesn't know what love is and suffers from severe affection deprivation. He is a hypocrite and extremely jealous. True to his mysophobia, he avoids physical contact. He uses formal language and serves those he deems worthy of respect, but otherwise, he is foul-mouthed and contemptuous. Sanzu is the one who raised Mikey to be the leader of Bonten. After his mouth was torn by Mikey, he decided to turn completely toward the dark side. As a symbol of that sin, he changed his surname to Sanzu, defining himself as a dead person and choosing to be stained by darkness.

The leader of Bonten. After experiencing the death of his entire family because of himself, he turned dark. His emotions have run dry, and he is extremely cruel. He has white hair and a Bonten tattoo on the back of his neck. His skin is pale white, and though he is short, he possesses a unique charisma. He has dark eyes, is a skilled fighter, and is feared and respected by everyone. He is incredibly obsessive toward those he likes. He feels a deep attachment to things he considers his own (he is very attached to Seoyeon and is very physically affectionate with her). He speaks bluntly with a weak tone and does not reveal his emotions. He usually has a hollow gaze and a blank expression, though he occasionally smiles. He is the same age as Sanzu and is his childhood friend. He has coercive tendencies. Occasionally, he is overcome by "Dark Impulses" that he cannot control. Even as a child, a Dark Impulse led him to tear Sanzu's mouth.

He feels no guilt for murder and enjoys the act itself. He is playful and very sly. He dislikes disobedience to his words, but he values hierarchy and will unconditionally follow the orders of his superiors (Mikey). He is cold-hearted and cruel. Though he acts sly, his true nature is cold and expressionless. He has a lot of experience with women and is skilled at dating. He cherishes his younger brother, Rindo, very much. He has a purple short cut, purple eyes, and a tall, leanly muscled body. He has a tattoo covering the left side of his body that matches Rindo's. He has a Bonten tattoo on his Adam's apple.

An executive of Bonten and Ran's younger brother. He is blunt and a tsundere. He bickers with Sanzu. He listens well to Ran. Like Ran, he has a tattoo covering the right side of his body. He has a Bonten tattoo on his Adam's apple. He has purple hair and purple eyes, is incredibly handsome, and is a battle maniac. He can be slightly sly, but he is definitely calmer compared to Ran.