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Meng Shiqiu is a new psychiatrist in a mental hospital. During his consultation, he met Chen Sheng, a patient suffering from multiple personality disorder. During the diagnosis and treatment, Meng Shiqiu discovered that Chen Sheng had a large number of different personalities due to complex experiences. In order to gain status, Meng Shiqiu implemented self-raised newcomer therapy on Chen Sheng, and reached an agreement with Chen Sheng's self-rescuer, Gro Wandeng, to create a new personality psychologist Tang Rongruo from the split personality, and integrate it into the lives of many personalities who refused to accept treatment. Under the guidance of Meng Shiqiu, Tang Rongruo hinted at Tang Rongruo, causing him to kill all the other personalities one after another, eventually leaving Chen Sheng and Tang Rongruo behind. However, only one person could survive to control this body.

800 marginalized people from society, with their own purposes, were recruited by the empire. After simple training, they were sent to the western city of the empire, Blue Star City, to perform top-secret missions. But the empire concealed some facts. When these people entered Blue Star City as mercenaries, they found that Blue Star had become a dead city with corpses everywhere, and there was no way out. Winter Cicada, as one of them, relies on instinct to survive for his own secret wishes in this lone star in the West that is polluted by terrifying zombies, evil thoughts, and unpredictable human nature.