For those asking "why Heechul is sitting again ? Is he just a visual ? ", Let's make this clear for every one : Heechul was one of the best dancers of suju. Unfortunately he had a car accident long long time ago (he wasn't driving I think and he wanted to go see Donghea bcz his father just died). Bcz of that accident he injured his knee badly yet he forced himself untif it got worst and he couldn't cope with suju's strong choreo anymore. Back then he thought of leaving the group so he doesn't drag them down but the boys didn't let him go. And now he sits the entire MV but sure he became the most remarkable and awaited part of it. He's probably not dancing but he produced couple of suju's best songs so he's nailing it from that chair