Mo Han didn't know where he came from, maybe he came from a parallel world where he had performed missions, because some people in the headquarters were brought there in this way. Some of them have extraordinary talents, some have special skills, and they are all people who have been abandoned by their own world or abandoned the world with their own hands. Everyone who comes here must sign a blood contract, swearing to never reveal the secrets of the realm to anyone, and to be loyal to the realm forever. Otherwise, haha, you know.
In other words, it is a contract of sale.
The existence of the contract reached with blood as a guide has lasted for thousands of years, and the story begins here...