Goodness me, Wonseo. Please, talk to Eunha what you're feeling. Stop hurting and blaming yourself.
Seriously, they need to discuss where they actually stand in their relationship.
Please don't get distracted and get freaky now. They still need to talk things out as well as prioritising Eunha's debt. I'm scared her dad calling is a sign something bad is happening and tries to warn her. And then Eunha ignoring it will make her upset once again. I doubt she'd blame Wonseo since she's already trying to make up for everything but considering Wonseo is in a path of slowly trying to detach herself from Eunha, this will definitely push her more into that idea.
P.S: I can't with the way Wonseo is trying not to reciprocate Eunha's hugs even when they were at the hospital she's blaming herself so much. I rather prefer for them to take some time for themselves and heal first than hastily get back into a relationship.