The sheer joy in this moment. Help I love it.
There's such an element of play and happiness in #Seonghwa and #Yunho as they perform the choreo at and for each other. (context: the performance isn't formal, they're just doing it for funzies.)
Also, Seonghwa's arms-outstretched "butterfly wing" spin -- which I've been rewatching the music show stages to see if it's in the choreo, and it looks like it's just him enjoying the moment.