That’s true, but I think it would be realistic. And it would also go to show that the things you don’t want might end up being something you like! A lot of people have this opinion of “not liking kids” and “not wanting them” but a lot of people actually end up adoring their child and I could see the mc doing that.
I mean this is seen in RL (as u said but also) with some ppl saying that they hit a certain age and suddenly are struck w baby fever, but I believe that just even as a story I think the brother is enough of "their child" and that relationship should be more established (the "couple/& the trio) before thoughts of a child should be introduced into the story (imo). A child would be fun & cute but it would change the dynamic which could be good but I dont think its necessary for the story, especially for the main storyline (may even be too much).

this is one of my favourite manhwas, like of all time, I love the story and the writing and the characters so much
however
I don't know, I feel like if he really is pregnant, it will kinda ruin the story for me. like obvs I'd still read it and like it, but I just feel like it doesn't fit, neither in the narrative nor w the characters
like euihyun NEVER wanted a child, he has explicitly stated multiple times that he doesn't want a kid and has taken precautions and even the morning after pill to avoid that, god he went to the hospital to make sure he didn't get pregnant. and I think if he is and decides, w taeju, to keep it, it wouldn't be in line w his character and it would just feel forced