Because when eunyeon got his pregnant, he's hiding it from euisol. And yk at the first they just like doing hex for pleasure, and euisol also thinks that maybe the father is another person. Cus he doesn't know, maybe eunyeon sleeping with another person? Or maybe with that VP. that's why when he knows that the baby is his. eunyeon became anxious and scared, euisol will ask him to abort it, or maybe doesn't believe that he is the father. They really took a long times for saying i love you, they still that both of them like fwb

Why it may not be his ? I can’t remember he doing it with someone else and how the other guy is pregnant and claiming that Mr crazy is the father