[Mini Op Post]
This is a video that shows that it was the anti-fan who hit Yoochun, not the other way around. He was defending himself; in this video, one can see that he didn’t hit her, he held her head to stop her from reaching out at him again.
C-JeS is also already taking legal action against the persons responsible for spreading the video and causing ill-intent against Yoochun.
*PS: C-JeS has not released any official statement regarding this matter, but yes, they are already taking legal action. Please see this post for more information.