The first person that popped into my head was the second lead from My Princess. Yoon Joo, was it? See, I despised her so much I didn't even bother to remember her name. Anyways, my contempt for her stemmed from her personality (as does my usual loathe for K-drama second female leads), but unlike other second leads, I cringed every time she showed up on screen and if it was possible, I would've reached into my computer screen and slapped her numerous times. She was so spoiled, the epitome of a greedy, selfish brat. She couldn't let go of either Hae Young or Jung Woo merely because she didn't want Seol to have either one of them. Then, after she gets fired from her job as the museum director, she gets another one of a similar position handed right to her but SHE STILL COMPLAINED. I'd feel bad for you, but that's what you deserve for wanting everything, you avaricious brat.
Sorry, just thinking about her gets me annoyed all over again -______-