I'm sure they having a party and fun behind the cameras. I mean, when Wooyoung smashed HJ face in the cake at his birthday they made him perform the whole concert with cake on his face 😂😂😂 I'm sure they are like: you get one chance we make you pretty, after you go on stage you do you 😂😂😂
Calm down, no one pulled his hair, if was more like the member just flick it upwards, they would never do anything to hurt him on purpose, they love him and they care for him and he wasn't screaming, he was singing his part in the song