Time group card collection is a promotional activity. You can get a card set by purchasing specified goods or participating in activities. After these cards are accumulated, they can be exchanged for limited edition peripheral goods, such as postcards, posters, signature photos and so on. Card-collecting activities can increase the interactivity of fans and is also one of the ways to support idols. Collecting cards is not only a collection, but also one of the ways for fans to express their support for idols, and it can also increase interaction and communication.