Ok-bin Kim! She is amazing! I only saw her in "Thirst" (and it seems to be her only major work) but I fell in love immediately. Somehow she can express emotions without words, just with her face (and that's hard thing to do, think of Kristen Stewart keeping the same stone face during the whole trilogy :D. Ok-bin Kim can be funny or completely evil and insane within the same movie. As far as I know she's professional model but I think she really should dedicate herself to cinematography.