This is the most frightening and most tragic Korean crime thriller ever released since the movie "Midnight" that came out in 2021, but this villain is wielding a freaking smartphone as an invincible weapon instead of a traditional axe. First off the cinematography and soundtrack is really futuristic, almost like a high tech dystopian world which corrupts digitally. The main innovation of this movie will be its storyline, the headlining villain is skillfully designed as a tech mastermind, Im Siwan's performance here is absolutely mind boggling as he went berserk while hunting for his prey with technology. As if that wasn't insane enough, the ending reveals something much bigger that is ultimately mind blowing and everything turns into maximum monstrosity for every character in the movie.