…

Right. It was only for one panel but look at his gaze. You can tell right away

yeah, that panel made me sad for both characters.
I know they'll end together somehow but seeing how he looks at the family makes me think their relationship is forced. Because I know in real life, a straight man can't easily change.
I want to believe that Eusan was bi or gay all this time but still wanted to have a family and ends up going with Ian and adopt a kid.

Yeah… I went to reread the chapter where the ex wife returns the ring and something she said stood out for me bc what’s the full story? -> “be honest we both know you didn't say you'd
wait for me because you loved” (ch. 10) and right after Eunsan has the anxiety attack… I wonder if she’s implying his sexuality?

Wait for me because you loved me, anyway*

or would he have waited for her just because he wanted kids?

Yes! It looks that Eusan never had motivation, commitment or care during his marriage. I also think it is implied to his sexuality, or maybe just professional dissatisfaction but I guess we’ll know later.