Lin Yu was originally an ordinary college student. An unexpected encounter at a used bookstall led him to be involved in the mysterious world of yin and yang. Since then, he has mastered the magic of yin and yang, and joined forces with Su Yao, a paranormal enthusiast, to explore the truth among the frequent strange events in the city. It turns out that an evil force is trying to break the balance of yin and yang and release ancient evil spirits. Can Lin Yu use what he has learned to protect the order of Yin and Yang with his partners and resolve this shocking crisis?