Xu Lang, a good-for-nothing young man who was kicked out by his stepmother, unexpectedly got a copy of "The Contract of the Sultry Detective". This contract book allows him to sign contracts with various characters and obtain each other's special abilities - provided that he must complete the commission in the most arrogant way.
The stepmother took away his father's property, kicked him out of the house, and hired a detective to stomp him to death. But Xu Lang backhandedly signed a "loyalty contract" with the detective, making him his little brother. From then on, he began to use various tricks to sweep across the city: signing a "love contract" with a rich woman to receive a villa, signing a "master-apprentice contract" with a master to learn peerless medical skills, signing a "brother contract" with a gangster to absorb the entire underground force...
The more suppressed his stepmother is, the more contracts Xu Lang makes; the more arrogant his enemies are, the more outrageous his tricks become. It only took Xu Lang one month to go from being a loser who was kicked out of his home to becoming a contract king who controlled half of the city. But just when he thought he could lie down, he discovered that this contract seemed to hide a deeper secret...
