In pursuit of inspiration, Song Lin mistakenly entered a closed town called "Secret City", where he encountered a series of strange visions and trapped six people. Bizarre disappearances, strange letters, and strange stories come true one after another, and people with different identities have to work together to investigate the case to survive. As the truth is revealed, the history of Youcheng, the source of the vision, the struggle of human nature, and the humorous and absurd mystery of the secret room are revealed one by one. Everyone experiences life, death and transformation, and the ultimate secret behind the strange phenomenon in Youcheng is finally revealed.
