Guardian : zhen hun. 1
(Book)

Officially in English for the first time: the modern fantasy danmei/Boys' Love trilogy about gods, ghosts, and supernatural investigations! Zhao Yunlan heads up a covert division of the Ministry of Public Security that deals with the strange and unusual, blurring the line between the mortal realm and the Netherworld. His cocky, casual attitude conceals both a sharp mind and an arsenal of mystical tools and arcane knowledge. While investigating a gruesome death at a local university, Zhao Yunlan crosses paths with the reserved Professor Shen Wei. Zhao Yunlan is immediately intrigued by Shen Wei's good looks and intense gaze, and the attraction between them is immediate and powerful, even as Shen Wei tries to keep his distance. Shen Wei and his secrets are a puzzle Zhao Yunlan feels compelled to solve as mysterious circumstances throw them together, and their connection becomes impossible to deny.

Translated from the Chinese.