Minjae

Was such a selfish and irredeemable POS. He didn't deserve a "good" ending. He deserved to pay for what he did to the father's son and how mistreated and used people around him. His nature is far more twisted than the father's who was seeking revenge for his son that were killed so brutally and vindictively. For making the mistake of showing kindness and sympathy to someone who clearly did not deserve it. The big reveal of this is, Minjae was the real villain of this story all along.

Even his "trauma backstory" did not justify what he did to Eusang.