Ethan's Feeling For Ye Jin

Ethan frowned when he heard Mi Sun's words, he who had occasionally glanced at his computer monitor, now looked at Mi Sun. 

She managed to get his full attention. 

"What do you mean noona? Why should I refuse Ye Jin?" asked Ethan, confused. 

Mi Sun is one of the people that Ethan respects, so her  opinion is often heard by Ethan. However, that doesn't mean he'll just listen to it without arguing first. 

Mi Sun is silent for a while, wondering whether she should tell Ethan or not. 

Well, looks like she'd better not have to tell him because it's just a guess and Ethan might think she's exaggerating.

"Then why should you accept Ha Ye Jin?" Mi Sun asked back. 

She felt that she would lose the argument with Ethan if she didn't tell him her reasons for rejecting Ye Jin, besides, she would also sound unreasonable if she simply rejected Ye Jin for no reason.

So, Mi Sun wants to hear Ethan's reasoning.