I have a Lover fits very well, she's such a bad woman. She does change by the end but not by leaps and bounds. She learns right and wrong yes, but she still stays a (somewhat) cold, calculating badass. Her husband is more emotional, idealistic and fragile and she tends to protect him throughout the drama.
Bow see chompoo has a gold digger who wants to swindle an older dude and the ML is the protective son. Don't know that he's necessarily kind to her, but he's nice overall to other people.
Cheongdamdong Alice is about a wannabe (but fast learner) golddigger and the ML is her mark. He's been hurt before and is kind of a softie in front of her.
The happy loner: she's not really bad, more like extremely cold and distant and he's a cute little puppy that she mistreats for a good chunk of the drama. It's a 2 episodes show.
Game sanaeha is a bit of a role reversal, she's the rich heir coming from abroad who meets her (poor) childhood friend and decides to use the innocent young thing for her schemes . He's pretty smart though and is holding his own but he's nice and she's a spoiled brat. At the end she's the one who has to ask for forgiveness and grovel.
Get Karl OH Soo Jung: oldie but goodie drama. She's a shameless golddigger. But she's not too bad.