The new school has been taking over the school for three months, but no one has ever seen the true face of the new principal. Suddenly one day, the "scary ghost" team secretly organized by Lin Xiaoshi, Guo Jia and others received a letter of entrustment about the new principal. The content is that the reason why the new principal has not revealed his identity is because he mysteriously disappeared in the school the day before the official takeover. Before the disappearance, the new principal had insisted not to go to the archives in the underground, the reason was "He is still there, he will not let me go!"
Therefore, the writer hopes that Lin Xiaoshi and others will find out the truth and rescue the principal.
Although Lin Xiaoshi and the others were full of doubts about the anonymous letter, the letter provided generous suggestions and confirmed their suspicion that "there was something wrong with the principal", so they accepted the commission.
But as the truth emerges, their lives become increasingly dangerous...