Watching eps 13 and 14 with subs firmly cemented two incompatible things in my mind:
1. Joo Won and Ra Im really do love each other and would be miserable without each other at this moment (especially Joo Won - if he lost her, he couldn't function - notice that he even gives up his meds when things are going well with her but when everything goes to hell in ep 13 he starts taking them again). They are crazy, passionately obsessed with each other.
and
2. I can't see a long-term way for them to be together at all. If she entered his world, she'd be miserable, withdraw, lash out, and then leave him (even if somehow his Mom magically became OK with her). If he gave up his world for her, he'd be happy in short term but in long term start resenting her and leave her eventually.
So yes, if they gave each other up now, they'd be more miserable than if they stuck together despite the differences and the difficulties and insanity. But in long term, they'd be miserable if they stuck together, too, unless there is a way out of either being with his family or giving up his world and entering his. It really is a Little Mermaid situation - the Prince can't live in the water, obviously, but the Mermaid can't be on land without being in horrific pain and losing what makes her herself.
Writer, find some way out, pls.