Upgrading a card means raising a C, B, A, or S card to ★5 (maximum level) and then upgrading it to the next grade, creating a B, A, S, or R card.
■ How to Upgrade Cards
- Using two ★5 cards of the same member and grade
▷ Both cards must belong to the same group and member, and have the same grade.
▷ Both cards must be at maximum level (★5).
- Using Multi-Up Cards
▷ The number of Multi-Up Cards required varies depending on the card’s grade.
※ When attempting to use cards of a specific artist, if one card is a solo card and the other is a group card, they are considered from different groups and cannot be used for upgrading.