Took me a while to pinpoint my problems. Anyways, it's because I think the setting doesn't allow for much romantic development (considering the fast-paced action) nor does it need any. There's always a new challenge for Him Woo and he keeps striving to be stronger. I think that's what makes this story so addictive. I don't see the point of adding romance to the plot if it would lack depth anyway. And Hae In is a strong Hunter. Though I understand that she was shy coz she's set to be a girl w/ zero love experience, I think it would be sad to turn her into a love interest just because she's there.

I'm sensing something here but pls don't let there be any sort of romance between Hae In and Jim Woo. It wouldn't feel right in the story. Can't explain why. I'd rather see her be the cool female Hunter friend who admires his skills and completely overcomes being that shy and blushing inexperienced girl with a crush (possibly love interest).