Fusu was reading medical books in the palace, and suddenly received a secret report: Hu Hai had secret contacts with the world of immortality. Fusu used the concealment technique inherited from the medical saint to visit Hu Hai's mansion at night and found that he was having a secret conversation with a man in black robe. Overheard that the man in black robe claimed to be from the "Xuanyin Sect" and promised to help Hu Hai seize the throne.
