I Judge Yin and Yang in the Mortal World

Mo Yang has yin-yang eyes. While being hunted by a vengeful ghost, he stumbles into the Yin-Yang House. From then on, he reopens the house, takes charge of the Book of Yin and Yang, and wields the Yin-Yang Brush, righting the wrongs suffered by ghosts and monsters in this world and receiving gifts from them.

He deals with ghost messengers, ghost generals, and ghost emperors, obtaining the things he needs.

After receiving a treasured gift from the King of the Underworld, he conceals his human aura and uses his connections in the Underworld to travel between worlds. He gets what he needs within a limited time, then returns to the Underworld to break through.