That's what happens when you miscalculate your powers and capabilities. It looks like Cooky was doing legs yesterday, and today he can't walk normally in our fanart BTS BT21 Cooky Crawling Sticker. As you know, Cooky is a muscular pink bunny created by Jungkook, so he got used to the training like this, but yesterday he took too much. Now he is exhausted, hungry, and can't do anything about his legs.