The Strange City with Nine Rings: the City Has Nine Rings, but I Have No Rules.

Outside the Nine-ringed City, there is endless mystery; inside the Nine-ringed City, blood determines destiny. Chen Ju was once the most prosperous young master of the Chen family. Until the day of the entrance test, only a dazzling "zero" appeared on the blood test tablet. His parents are missing, his family has been expelled, and everyone is waiting to see him fall into the ninth ring and die. However, he changed his mother's surname to Wu Ju. Others rely on their ancestors to control weirdness, but he has an empty ring in his body that can accommodate all the rules in the world. When the nine doors opened and the artifice lowered its head, the Nine Rings Academy realized that this madman, rejected by all bloodlines, might be the most terrifying monster in the city. Wu Ju: "You follow the rules because the rules protect you." "I don't defend because it can't stop me."