There is a small card in the album blackpink. You may not have bought the genuine product. Cam is a picture taken by Aidou for this album, most of which are unpublished pictures. The front of Cam is mostly written by Aidou, and there are signatures and so on. So many fans collect it.

Some fake cards will be bigger and darker than the real ones. Its back can't be the same as the real card.