The irony of the dude being angry that his daughter was the type to sling drugs, do shady businesses, and act like an evil bitch, but then saying that he'll kill the people who are holding grudges against her all while acknowledging that they're valid in holding their grudges against her because she's an evil person. Brother, just accept you failed as a father, as a person, in every single front. You couldn't be there for your dead wife, couldn't be there to even be a father to lead your daughter down a right path and just left her in the hands of a chaebol family (considering how infamous they are for being corrupt and evil), and then had no idea what your daughter was ever up to ... and then NOW you're trying to say you're gonna play a good father ... by trying to kill? Dude had all the chances to still do his best to have a relationship with his daughter, but he just gave up and instead chose an assassin's life.