The King's Woman - also FL starts strong she later kind of loses herself IMO
The Wolf - ML is not really bad guy at heart but he deliberately chooses to act as such and as a result he is pretty bad toward FL for most of the drama; FL gets progressively stronger throughout all of it
Goodbye My Princess - he doesn't start outright bad (although shady for sure) but becomes worse and worse, not sure if FL might be considered strong (maybe if endurance can be considered that?)
Also is Six Flying Dragons you will find ML who even though doesn't start bad turns out pretty dark and scary in the end. FL remains strong for all the drama ( actually that would apply to SFL also)
