
Keith committed rape, so he's not 100% innocent but he did get brownie points for trying to take responsibility for presumably someone else's child and their mother. He seems legit concerned about Yeonwoo.
Yeonwoo is way more toxic than Keith. He's manipulative and put the baby in danger just to test Keith's commitment to him, which is some standard thot behavior. If he doesn't want the baby he should have just aborted it instead of testing and drugging people. He could have quit his job long ago and just cut Keith out of his life, baby or no baby, instead he's playing stupid games. Instead he has to be dramatic and irresponsible.
And Yeonwoo only gets worse from the spoilers I've seen.
I'm team Keith.

If you've seen the spoilers then you I ow he couldn't have just gotten it aborted without running from Keith. This is his payback which Keith fucking deserves for raping someone multiple times. He is going to get rid of the baby which Keith also tries to prevent. I don't know what the fuck is wrong with y'all supporting a fucking rapist
This one and Yours To Claim have this reincarnation/body hopping subplot going on that's being 100% ignored that makes me so curious. Like it's just touched on that the lil bro is actually someone else that reincarnated into his body. How is this just pushed aside?
It's really not reincarnation, the author just worded it differently.
Spoiler....
He wasn't actually reincarnated, he "stole" / replaced himself with the real Xin Nian, if I remember correctly, his actual name is Li Pingshi. The real Xin Nian is still alive and he's actually a very nice guy!!
:0! Does big bro know?
.....
Yes, he knows that the Xin Nian he knows is someone different. Also the two brothers are reunited in the end.
Tyty!