Tang Qian works in his family's mental hospital. He has no future, but he has a father who is the director. In response to nurse Lu Xueqi's question, the two of them ran to the archives room, but did not find File No. 31. The more curious people are, the more things they will discover. The long-dusted history, the ancients living in the past, Tang Qian was inadvertently involved, but he could not escape according to his own wishes...