Chen Feng, a psychiatrist with in-depth research on micro-expressions and behavioral psychology, found himself involved in an incomprehensible supernatural system-the mask system after treating a strange patient who claimed to be "occupied by a character". Wearing different "identity masks" can gain corresponding abilities, but the price is the erosion of self-awareness. When his first patient died mysteriously, leaving only a blank mask at the scene, Chen Feng was forced to put on the first mask and embark on this dead-end road of "playing someone else in order to survive."