Responses
I am not really sure what you are saying?
The MC's ex is Jaebeom (the dude from high school who does music) while the kid in the cooking contest is called Gyeongchan who we know nothing about so far (I am assuming he could be the MC's student at the academy, but that's just a speculation)
Ok sooo, the red head its a student who is in the same contest with the bottom, the crazy ex broke up with him on chap 2 :))