I agree that he's changed, but the reason he left is actually because he thought Dojin was going to "push it on" (Byul) him. He overheard a small bit of Dojin and Heesoo's conversation and, like the time where he overheard Dojin say he gets inspiration from him, he jumped to conclusions again.
I think he's like any other mom, who wants to be around their newborn baby, he's going through withdrawal (sorta) and it's making him stressed out and depressed. Hence the last page..
It could be that but I think that was his heat. I could be wrong but those might have been pheromones being released when the heat comes. Then again I could be wrong
Yeah, I can see how he thought they were doing to put the baby all on him. I mean he doesn't have money and he thought they wouldn't pay him. So it makes sense for him to leave the baby with them. I guess he hoped that they would take the baby and give him somewhat of a life. And yeah, he is like every other mom, but I also agree the last page was him getting his heat again. Just cause he gave birth doesn't mean he doesn't have a heat. Or since he gave birth with an alpha. I think he's heats are way worse than before cause his body is wanting the alpha next to him. So his body is give off more to hope the alpha smells him. (Can't remember if there was marking in the universe.) He also hasn't been taking heat pills too I believe. And.... Guess who is also an alpha that is standing in front of him!!!!! (I just thought about that last part!!! I'm going to read back to see if his butler guy was an alpha!)
He doesn't have a house also and he can't work as he is an Omega so how can he raise the baby. It's so normal to run in this condition TT TT TT.
Everyone who thinks the Omega hasn't changed. He actually has. He left cause he thought they were just going to get rid of the baby. He really wants to see and hold his baby. That's why he looks so stressed. He really is, the bad guy here is that guy. He's making up stories to tell the omega. （￣へ￣）