After receiving a strange phone call, debt-ridden young man Lin Mo enters an abandoned hospital to search for his missing younger sister, only to be attacked by the vengeful spirit of a child in red. On the brink of death, he activates the mysterious “Spirit Ledger” System. The System turns supernatural powers into data, assigns missions, lets him exchange for skills and unlocks a bestiary of ghosts, giving him the means to fight them. But as his investigation goes deeper, Lin Mo discovers that his sister’s disappearance is linked to a series of supernatural abductions. Each crime scene contains an object from his childhood, while the muttering of twelve children in red in his dreams points directly to his forgotten past.
The “Spirit Ledger” System reveals that Lin Mo is the key sacrifice in the resurrection ritual of the ancient evil god “Shadow of the Old Ones”: the thirteenth child in red. Within seven days, he must use the power granted by the System to fight five powerful bosses controlled by the “Mistveil Society,” each representing one of the ritual’s five stages: memory, fear, blood, time, and space. He must solve the mysteries and save his sister. But every time he uses the System’s power to resolve an incident, his memories return faster, pushing him toward the abyss of the final sacrifice. He moves between the official Bureau of Supernatural Investigations, rival players, and informants whose loyalties waver, turning the tables in the face of despair and making horror into something he can tackle. In the end, he faces the ultimate choice: sacrifice himself to complete the ritual and save his sister, or find a third way to destroy the “Shadow of the Old Ones” and the conspiracy behind the System once and for all? It is a race against time, fate, and his own fear.
