 If you liked
Change Guy
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 ...then you might like
Weak Hero
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Two manhwa with delinquents in school settings. The main character is a boy who is eager to receive good grades and does not skip any class or lesson. He has a weak appearance and/or no experience with fighting at all, but he quickly learns how to neutralize that weakness.
This is in contrast to his comrades who behave like they want to drop out of school to participate in street fights.