This might be a challenging one as I'm only like 60% sure it was on this site.
This was a story I read a few years back. At the time I think there were only a few chapters and I don't know if any more have been added since.
The mc was enrolled at a superhero school but was quite bitter about...
Title basically. If I take a given genre and sort by latest update I have noticed that it doesn't show all of the stories with that genre when they update.