The volume valve is the archives management department of the Zhang family, which manages the intricate archives. Among them are all-encompassing events, celestial falls, underground caves, abnormal ancient corpses, unreadable geological exploration data, ancient underground buildings that cannot be judged useful, and so on. The Nanyang Archives is actually a department that collects the truth. There are truths about actual things, as well as truths between people. What is the truth? This is a vague term, to sum it up, it is just: What is in the mind of people?