During a team-building activity playing a murder mystery game, Yang Ling unexpectedly travels to a world called Dafeng, taking on the identity of a constable at the Changle County Yamen—Xu Qi An.

Xu Qi An and the Night Guardians investigate Sangbo Lake. They find a formation underwater...

Xu Qi An reports to Wei Yuan that the clues he discovers are pointing towards Qinglong Hall. Tiandi Society's No. 6, Heng Yuan is also missing.