Responses
Sekyung felt guilty. He blames himself for not doing anything and Yiheon ended up disappearing. This is why he wants Yiheon to return. It's for atonement. But then he finds himself falling for Deukpal and now he's in a dilemma. At one hand, he wants Yiheon to return so he can atone. On the other, he doesn't want to lose Deukpal either who he's fallen for.

Why is ML suddenly worried about Yiheon ? I don’t really understand his reactions…