Find a novel about being Mr. Yin and Yang?

My Years as Mr. Yin and Yang is a novel about becoming Mr. Yin and Yang by Cui Zouzhao.

The story tells that Cui Zuofei, the hero, accidentally crossed into the underworld and became a gentleman of Yin and Yang. His work experience in the underworld, what he saw and heard, and his struggle and cooperation with various ghosts and monsters constitute the main line of the whole novel.

In the novel, Cui Zuofei gradually adapted to the life in the underworld through his own efforts and wisdom, and started his own path of practice. He made many friends, including some mysterious beings, such as white impermanence, black impermanence, cow's head and horse's face, etc. He also encountered many dangers and challenges, including fighting evil spirits and solving paranormal.

The whole novel is full of sense of humor and suspense, and at the same time, it also discusses some profound philosophical issues, such as life and death, reincarnation and human nature. It is not only an interesting fantasy novel, but also a literary work of thinking about life.