The clear point of the revised album is the follow-up album. Follow-up albums are a common method used by their company to increase popularity and sales. Almost every regular album of every group in their company has a follow-up. (For example, Function's "Hot Summer" and SHINee's "Why So Serious")

The follow-up stage is the singing stage for the follow-up album. The previous part, such as "Wolf", will come to an end after the promotion period. "Roar" is the latter part, the follow-up.

When you release a new song, you have to go out and gain popularity