In the bustling ancient city, there is such a shop. The huge plaque has no words. No one knows what the shop does. The owner of the shop, Ye Xiaolou, a glamorous profiteer who lives here, is also rumored to be mysterious. Even though he helps people solve their problems, the reward he asks for every time is terrifyingly high. The people he dealt with were all non-human beings, but he lived safely until now because of the presence of three non-human beings and immortals around him. What kind of story is this?