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Late one night, young psychiatrist Su Zhixi received an invitation letter from a mysterious sanatorium. The letter promised that she would receive a huge reward as long as she participated in a thirteen-day psychological evaluation task. But after arriving at the sanatorium, she found that everything here was shrouded in a strange atmosphere: thirteen rooms, thirteen mysterious patients, and there was an ulterior secret hidden behind every door. With day after day of psychological treatment, Su Zhixi gradually discovered that these so-called "patients" were closely connected with her past nightmares... And the thirteenth door seemed to lead to the untouchable truth deep in her heart.

A remote town called Jingyue Town is picturesque but sparsely populated. In recent years, mysterious disappearances have occurred one after another in the town, but no one has ever found the truth. The protagonist is Lin Qing, a young reporter who came to town to investigate the disappearance of his friend, but was accidentally involved in an unfathomable conspiracy.