Of course, it is forgetfulness, forgetting the original characteristics of things and forgetting the past. Forget your original situation or the origin of things; I don't know how to repay my kindness. The source of the Book of Rites and Music: "Slow is easy to break the festival, but drifting is forgotten." Kong Ying Da's book: "Prostitution is rampant, and getting carried away is fundamental." This phenomenon is very common now, and can be written from many places, such as international students, who are well treated abroad but forget their motherland.