So Hwa is not immortal unlike his parents. So that's why he felt the distance and hyung gave him a place to belong and create his own family.
P.S. : the typesetting was shitty. I have to mention even though I am grateful to the uploaders.
And how there is a drain inside the operation theater/lab?
I think the artist is subtly saying the obsessive fans and haters "to fuck off." It's not easy dealing with traumas cause of something you love to do. Artists want to be appreciated for their work not to be harassed by paparazzi, stalkers and friends like this bitch.
This was a good plot and broke the stereotypical flow of the yaoi in so many ways.
Who wouldn't want a son-in-law like that! We NEED GOOD GENES.