i have to ask about jjong and minho..

I dont watch korean shows much..rarely ever.. But on tumblr i saw a gif of minho acting cute on a stage and a girl(the host-another idol, hyoyeon i think..?) Hugged him and jjong got this jealous look and came up and shoved them apart then gripped minho by his shirt front and shook him and key had to yell at them to stop it... Now..was this a real fight that took place..or acting on a show? Idk the name of it, and there was no channel logo on it either :( But if anyone knows plz tell me ._.