I don't know if I failed to express myself well...
There is a strange noise in the back room. Noise pollution causes me to vomit and have a headache, which is similar to Ménière's disease, but I don't have this disease. Even if I turn off the game, I can still hear this electric sound in short time.
About 5:
Because there was a monster teaching players to train in the previous game, but it was deleted by the designer due to a bug. I think this is a good setting, allowing monsters to interact and follow players, and even be placed directly in the office (of course, this is not free, players need to complete all interactions and photos, or pay a high price for ink)