First 7 episodes: Great suspenseful thriller
Next 7 episodes: Monster of the week vigilante torture porn
Final 6 episodes: Evil government conspiracy melodrama

Seriously, it's like they murdered the story. They turned the mc from cool serial killer, into a slightly less cool vigilante, into a repentant bitch. Because koreans are pussies who can't have a serial killer for mc, the dramas even of this particular genre must be preachy and politically correct.

From ep14 onwards the mc feels so guilty about killing people he had no emotional connection to, that his entire goal is to give himself in and get a death sentence, but evil conspiracy who cleans up after him won't let him so he wants to defeat them to finally die. What kinda protagonist is that, and what kinda goal is that? Cringe, that's what.

I could accept if he stayed true to what the drama presents as his nature (suspend disbelief here, all saiko-pesu are ruthless serial killers amirite) and continued doing what he's good at, but his plot armor eventually run out and he got defeated. That would be cool. But a protagonist who actively strives to his own self destruction? That's just painful to watch.

FFS. 8/10 for how great the first half was, just skip the rest.