At two o'clock in the morning, all the shadows in the city will leave their masters and complete things for them that they dare not do during the day. Xu Qi, a municipal imaging auditor, accidentally discovered that his shadow had not returned; on the same night, a female engineer died in a secret room, and the only "murderer" in the surveillance room was her shadow. The criminal police investigated the case, but found that more and more people who were still living a normal life had long since disappeared. In order to clear the suspicion and retrieve the erased memory, the two must sneak into a city that only belongs to shadow before dawn.
