I completely agree with you. It's so fucking rare to get these stories where the ML's child is their bio kid, it's literally always a nephew/cousin/distantly related. At this point it's more surprising if the kid is his, knowing how prevalent the trope is.
I don't get it tbh. I don't get why these stories hate the idea that you can love more than one person in your life (romantically, and/or deeply love), and while it's a romantic idea in itself, in reality a lot of people will love a lot of people in their life, and that's okay and normal.
I mean, I can guess the cultural reasons - I've heard divorce is still p stigmatised in South Korea, and I'd guess that matches with the idea that you can only love one person in your life (=your previous relationships don't matter/weren't that deep/real). But! I'm not from South Korea nor do I interact with the culture much outside of these comics, so take this with a grain of salt.
(I already liked this earlier when it was posted, but due to the comment above going the opposite ("gonna drop this if he is the bio kid", which is an insane take imo considering that never happens) and getting responses, I wanted to comment on this to highlight it too.(￣∇￣"))
knew he wasn't his bio kid, lol
Kinda wish he was tho, we never get stories like that where ML just did have unprotected sex and took custody. Like the stories sometimes seem allergic to letting the ML have sex before he meets the FL or even having loved someone