Haha yeah! I’m not sure if you’re familiar with it, but in the Philippines we have this pregnancy superstition called “paglilihi.” It’s the belief that a baby might end up looking like or taking after whatever the mum was fond of eating, looking at, thinking about, or even doing while pregnant especially during the first trimester (or sometimes the whole pregnancy).
So honestly, I wasn’t even that surprised when the baby looked like Injun’s brother (or Injun himself ). Se-in mentioned before that he wanted their kid to look like Injun, and I think he was probably thinking that the whole time he was pregnant hehe.
Hii, I could see that applying if it were mentioned or the story was a Filipino one but as far as I’m aware this story is originally Korean. So I truly don’t see that applying here. Therefore it still doesn’t make sense the baby would look more like the Seme’s old body/his brother. And you can’t really play it off as the Uke hallucinating both with that appearance like in the valentines special because the seme himself remarks the similarities between the baby and his brother which means other characters can see it. Would have been a better option to just make the baby look like the Uke cause it kinda makes it feel like like, at least visually, that the Uke did it with the brother at some point.

The baby looking like his brother doesn’t make sense genetically cause the body he possessed isn’t related to him. But it is cute that the Uke sees the Seme as if he were in his original body rather than the current man he’s possessing.