LOL I read the translations of Request and everything makes sense now?
So the reason why Hoya acts all angsty (similar to If You Loved Me) is because the girl (on the phone background at the beginning) he likes likes another one. So, to cheer him up, Sunggyu sends him the song Request, and Sungjong takes a pic of the suit and writes “Hoya style”, and Sungyeol and Dongwoo record songs for him, I guess? And Dongwoo - wow that’s a hard one - I guess he dances with his tablet to show off his dancing skills?
It’s similar to Nothing’s Over except that they’re advertising Samsung products LOL