Drama where one or more characters have a redemption arc?

I want to see a character who you hate in the beginning go through a long series of events that change them slowly, until they eventually switch to being good.

Please mention the name of the character.

Thanks in advance.

• Maids - FL
• Madam - SML
• Moonlight Mystique - SFL 
• The Romance of Hua Rong Season 2 - SML
• Once upon a Dream - ML
• Time Flies and You Are Here - ML
• Skip a Beat - ML
• Summer's Desire - ML
• Iyashi no Otonari-san ni wa Himitsu ga aru - ML
• Squid Game - ML (not good, I'd say, but definitely selfish to selfless over the three seasons)