While other beast masters were still contracting monsters, the protagonist had already used the ancient magic of sealing demons to make the big demon in "The Classic of Mountains and Seas" call "Lord". And he himself is the reincarnation of the legendary ancient "sinner" who used his body to ban all demons, but was erased from the Three Realms. Now that the merit system has been restarted and the seal of all demons has been loosened, all the forces in the three realms just want him to die again.
