Three months after former detective {Lu Chen} resigned to open a detective agency, he took over a "suicide case". The knife marks on the deceased's wrist were exactly the same as the scars in his dream. That night, he was bound by a strange system and his mission was to "find the murderer of 'him' within 72 hours."
The medical school geek {Xia Xiaoxing} suddenly breaks in. She can see through the hidden diseases of the deceased at a glance, and she can also see through the abnormality of Lu Chen being controlled by the system. As the investigation deepens, Lu Chen discovers that the murderer is actually a "self-mirror" - a shadow that looks exactly like him and is controlled by the system; and the manipulator behind the system is infiltrating into the core of the case through the "Mistress" chess piece, trying to drag everyone into the system's cage.
Every mission triggered by accident is a gamble of life and death; Xia Xiaoxing's "rejuvenation" can not only save lives and heal the wounded, but also break the death trap set by the system. When Lu Chen faced the mirror image, he realized that this pursuit had started from the unsolved case ten years ago...
