Responses
I actually don't know too many manhwa with that plot. There is this:
https://www.mangago.zone/read-manga/the_superheroes_of_class_f/
But it hasn't updated in a while.
A manhwa similar to MHA/Assassination Classroom? High school bg with the kids having superpowers/plot, but an actual kid not a man/woman in their 20s going back in time