Nooo, I really hope not :P He's a messed up kid and she's... Well she's a mess too. You know what, you're so right,…
their parent did something wrong. it doesn't mean that they will do it too. maybe if he really like her or if her sister really care about the brother feeling . she will agree with their relationship and the guy will changed for the girl. I don't think it is really the guy problem, it is his father and step mom doesn't teach him or her sister well. i think Kim Young Dae will wanted to protected ro na and his sister will agree with it because she wanted her brother to be happy.
soon or later she had to leave her brother and her brother need to leave her too. they are already in almost university or college already or they already in university at japan. i think she need to learn how to grew up herself. he did everything for her sister but her sister never realized that he is not happy.
i hope Kim Young Dae and Bae Ro Na will fall in love and stay together. they look like they will be happy if they are together because they look like they know each other well in each other heart.