Connect

They are a little bloody and have some mysterious drama to it. They both have psycho and an interesting story

A man is kidnapped and one of his eyes removed by a gang of organ hunters; his eyes was transplanted into body of a serial killer; the unwilling donor now has terrible visions as he witnesses terrifying attacks on the residents of Seoul.

I'm surprised no one recommended this yet. This has so many similarities with "All of us are dead" and are both great watch and keep you at the edge of your seat if you're into this genre.

This movie was so damn scary, violent, gory and frustrating, I still liked it because of the "monster" whom annihilates everyone on his way. Not saying "Connect" has similar plot, but the friend of Irang made me think of this movie: they're both merciless when killing villains.

These two horror mystery dramas center around a male protagonist and his special eye that provides him with abilities/knowledge that others do not.