Most of these materials are released by the studio or the station sister. Most of the Star Station girls have some connection with the studio. They will warm up for a star's activities in advance to help them make their popularity more prosperous.
In the rice circle, station sisters who often get first-hand materials will be welcomed by fans, but the sources of these materials may not all come from the studio. Some station sisters will get relevant information through scalpers or other means. After sending it out, it will not only attract the attention of a large number of fans, but also make the star studio more closely connected with itself.
This is one of the reasons why many fans can know the whereabouts of the stars before the official announcement. However, there is another behavior in the entertainment circle called stealing materials, that is, some fans publish the status and photos of stars privately without the consent of the studio to attract fans.