Can anyone tell is this legit or not?

You’re looking for the back cover sticker.

Google Komca sticker guide.

Edit: https://aminoapps.com/c/lucyisland/page/blog/a-beginners-guide-to-kpop-albums-q-a-saturday/lZnZ_YptQuDeY6jmvjqznjjzjwLGJBXa8X