Because there are many idol groups in Korea, they will be forgotten if they don't return for a long time, and one or several groups can't always occupy resources. Therefore, each combination returns in turn to stabilize their popularity. Their return is to release a new album, play songs on the special folk stage of TV station, and have a period of continuous exposure to promote their new album, increase and consolidate the popularity of the group. If you don't return for a long time, the popularity of the combination will be lost, and those unknown combinations will gradually be forgotten.

Return is called back in Korea, which is what fans often call CB. Most Korean idol groups will be inactive for a long time when preparing new songs. Every time a new song is released, it will enter the publicity period and participate in various singing stages. There are many singing stages in Korea, such as the three major radio stations in Korea (SBS pop songs, MBC music center and KBS music bank). If you all participate, idols will be particularly hard when handing over, and there will be no rest time for a week in a row. When there is a return to the stage, there will be a corresponding farewell stage. After the publicity period, there will be a rest period, during which I will participate in some variety activities. This is the so-called farewell stage.

Generally speaking, a reward mainly includes song selection, MV, dance, costume, singing stage and other related matters. As far as song selection is concerned, it is generally the company that collects good songs and selects the works that most people are satisfied with and are expected to be out of the circle through internal voting. As for the album cover and MV shooting, it can be completed in a very short time. Most of them shoot MVs while choreographing, only the group dance part, and others are replaced by plots. Korean idol groups usually take three days and two nights to shoot an mv at a time.

However, the preparation time of different albums is different, and the brokerage company and external factors will have an impact. In particular, there will be many unexpected situations when songs are included in regular albums, and there are relatively many variables, so Korean idol groups prefer to send EP. Because some groups hope that every song included is excellent, with perfect details, and it takes a long time to prepare, it takes a long time to prepare a regular album, and it will return every once in a while.