Before I go on, I swear I'm not hallucinating and there IS a K-Pop song with all this stuff happening.
I remember listening to this Korean song a well over half a decade ago. The MV showed a school setting in which the artist was shown as a famous kid. Every time he runs his hand through his hair, girls are shown to fall over for him. There's a scene where he enters the cooking club and fantasizes his (possibly) crush, who is shown to be delinquent types, eating a burger and looking at him in a seductive manner, but then he snaps back to reality and seeing her devouring a huge burger with no considerations to manners sitting on the tabletop. I also remember there being a party(possibly filled with zombies I think) or something near the end of the video and that same girl chewing on bubblegum. If anyone can figure out which song I'm talking about it'd be of great help. Also if i remember correctly, the burger devouring girl isn't exactly his crush and outside the fantasy they don't even get along well.
Please help out if this rings a bell. It's a miracle I haven't forgotten the song after all these years, and would really like to now get to listen to it and watch the music video.