Responses
Well, for him his lover and the child with her are his family. And because of this whole family thing he couldn't live with them and even caused their death, if I'm not wrong. So instead of blaming himself he blames the mc. I think under these circumstances, it's easy to see him not as the own child.
Like come on now to hate his own son for something he doesn't have any control of what a jerk! I love this manga but the dad makes me sick