Xiumin is an underground fighter who spends most of his time exercising, training, and fighting. He has a tragic upbringing, him being a victim of abuse and neglect. It caused him to form a strong barrier between himself and the world, him having a coldhearted, hardened personality. He turned to fighting as a hobby as a teenager and has kept it going since. He has no relationship with his family, and only has a few close friends he met through fighting. He comes across in a rough and tough way.