After their backup ,I felt that the writer stretch the story too much . He wanted her to hate him but every moment of him towards her not only confused her but viewer's also . Basically what he wanted ,he wanted to take revenge as she trust her brother or he wanted her to realized her mistake of believing her brother or he wanted her to hate him as they same time he didn't want her to love someone else and move on .
At some point I don't like direction of the drama ,he loved her so much that he can't imagine anybody else , he didn't want to touch or kiss anybody else . Then why to show her he actually kiss somebody's else not one time but two -three more times . I think kissing somebody's else that she was not in his mind and heart . So I think kissing shouldn't be there between male lead and other girl.
Rest is good.