He first warned the older so I don't see what you're upset about, if he sees the older do something again then depending on the father's reaction we will be sure what kind of parent he is
"He first warned the older" bruh are you serious?! That dude literally knew his older is beating the shit outta his younger and instead of teaching him. An actual lesson or protecting the younger he just warned and let him be! Never even think about having children or giving advice to others dude. Literal wtf.
I agree with this
Exactly why I dropped it. ╮(￣▽￣)╭
So the older son is not even his own son but his brother's. But the Duke consider him as his own, still it doesn't give him the right to ignore his older son's abuse towards younger's son. Ugh I hate fathers like this in mamhwa.