Did yeodan just slap dan-i's butt? Haha
No, after that. When she said "ouch", chunyoung was grabbing her waist but i doubt that was painful, and if you check it looks like yeodam is slapping her butt that's why she said ouch. Though it's quite weird that yeodam did that but if he did then i guess it was a friendly slap since they are very close.
(Imagine yeodam with a small devil horn and tail ) hahaha so cute and sexy :3
Ishid is so cute when he gets jealous! >w<