Guardian

Set in the fictional city of Dragon City, the story follows Zhao Yunlan, the head of the Special Investigation Department (SID), an organization tasked with maintaining peace between humans and the mysterious inhabitants of Dixing (the Underground). When a series of strange, supernatural crimes begin to plague the city, Zhao crosses paths with Shen Wei, a reserved and enigmatic university professor who seems to know more about the dark history of the world than he lets on. As the two work together to solve cases, they uncover a deep-seated conspiracy involving ancient artifacts and a long-forgotten war between the surface world and the underworld. Their partnership evolves from professional curiosity into a profound, soul-deep connection, as they realize their fates have been intertwined for thousands of years. Together, they must navigate betrayal, sacrifice, and the weight of their past lives to prevent a catastrophe that threatens both realms.