Dramas with crazy ex or love interest

Hello! Looking for recommendations for romance dramas where the leads deal with either crazy exes or a secondary love interest holding a one-sided infatuation for either lead. Crazier the better!! Anything where they are trying to get revenge/destroy the relationship but the leads come out on top...bonus if there is a danger element or ML "rescues" the female from traumatic situations.

Some dramas I've watched that serve this storyline in a satisfying way...

Destined with You - Yura's character helping the antagonist putting the FL in danger / antagonist also obsessed with FL

You are My Destiny (c-drama) - Anna's character went obsessive

Edit to add Marry My Husband — this level of crazy is ideal lol

Honestly, I know there are a couple other dramas that hit this spot, but I can't think of them. Here is my full watchlist - Meeshelle's Drama List - MyDramaList