Drama with bullying-redemption theme.

Thank you!

Might be morbid and overtly grotesque, but maybe The King of Pigs.

The best bullying - redemption motive that I have seen was in The Heirs. But it involved the SML. He really regreted what he did and self reflected, which is rare in dramaland.  I rewatched his scenes few times (the worst second male syndrom in my life). The rest of the drama was meh though.