Park Shin-hye - I don't know. I just have these random dislike for her, and I can't seem to like anything that she've been starred except for You're Beautiful. I love her for her beauty, but acting-wise, I don't think she'll ever satisfy me with her acting.
Han Ye-seul - I first saw her on Myung-wol The Spy and wasn't really impressed w/ her back then. And then she began to be active on dramaland since Birth of A Beauty, but I just don't like her role there which made me to put Birth of A Beauty onhold. And then I saw her again in Madame Antoine, but there's something in her facial expression that made me dislike her.
Lee Min-jung & Jin Se-yeon - Idk why but they just gave off vibes that I don't like.
Lee Jong-suk - I don't particularly despise him, but I find his acting a lil bit lacking. I love him on School 2013 but his latest dramas just don't pick my interest even though he's loved more bcs of those dramas.
So the main point is whenever I dislike a certain actor/actress, it just bcs they often give off vibes that I don't like. It was quite random, but I strangely felt like that whenever I see these people above xD