I feel that I'm more interested when I can read the reasons for your dislikes. So decided to provide reasons too.
Hwang Jung Eum. (Can't stand seeing her plastic face and acting. The most hated one, will never watch anything she is in)
Jang Na Ra (Can't bear her face and voice)
Yoon Eun Hye. (Again, her plastic surgery'ed face feels uncombortable for me, as well as her acting)
Lee Bo Young. (Don't like her acting, facial and other expressions)
Song Hye Kyo. (Never touched with her acting, she has the kind of bitter arrogant taste. Whenever I see her I can't like her).
Ha Ji Won. (As she gets older, she overplays, don't like her acting more and more)
Kim Ha Neul. (Same as for Ha Ji Won)
Gu Hye Seon. (Something wrong with her eyesight, has no expressions)
Kim So Yeon. (I don't know, just very much not my type)
Shin Se Kyung, Kim So eun. (Just very pretty faces, but cant really act, both).
Han Ji Min. (Again tired with the unnatural face. Her acting is not bad though)
Han Ye Seul, kim tae hee. (Overplay)
Song Ji Hyo, Lee Ji Ah, Park Shi Yeon (Dislike at first sigh)
Park Min Young. (Under and overacts, fake)
Bae Yong Jun. (The plastic face feels uncombortable for me).
Jung Yong Hwa. (Uncomfortable face on the screen. I saw him live and there he looks so different, much better)
Jang Geun Suk. (The plastic face! Too artificial...)
Kim Hyun‑joong. (Same as for Jang Geun Suk)
Park Yoo Chun. (Annoying acting)
Park Hae-Jin. Hmm. (I like his roles, but his face is too uncomfortable, yes)
Lee Jong Suk. (Just already really tired with unnatural surgery'ed faces + don't like his acting, it looks rather like posing and modeling)
Joo Won. (Sick of his characters and kinda dumb expressions)
There must be more, but enough for now.