In the K-pop industry, "paper" often refers to the that come inside an album:
Tutorials often use square paper (e.g., 12cm x 12cm) to fold the iconic BTS logo. BtsВ Bts ЕћarkД±lar AlbГјm
Folded paper designs for album-themed bookmarks, frequently using purple paper or markers. In the K-pop industry, "paper" often refers to