Some may just debut; Some may pay attention to privacy; Some stars are too burdened to pull down their faces; Some shelves at the end are too high. In fact, it is also possible that it is not a press conference, nor is it a public occasion. People don't want to be recognized and cause too much commotion. Or it was inconvenient to work at that time. For example, I once went to Hengdian to visit the class, and Brother Long played across the street, which made it inconvenient for him to be approachable.