Bae Jung Ja played by Lee Hwi Hyang in My Love By My Side. She was the most outrageous mother and person I have ever come across in a drama. This was a really long drama 50 episodes..but I kept coming back just to see what ridiculous and just plain wrong thing she would do next. And of course to see her comeuppance :)
also gotta love Yoo Seung Ho as he plays a bad guy Harry in missing you and also a bad friend/Assasin in Warrior Baek Don Soo, Yeo Woon
I also loved all the bad guys in Holy Pearl :p