You Can't Kill Charlie

A teenage boy with powers, tortured in inhuman experiments, breaks out of a secret lab when special forces raid it. In his rampage, his power tears open cracks between reality and a mirror dimension. He's lost his memory and can’t remember the way home. He ends up in South Korea, where a gang of thugs hit him with a car and leave him dying in the road. Then Olivia steps in.

She's been bullied for years and is under the thumb of a violent crime ring. She puts her life on the line to shield him anyway. The ground splits open. Olivia, the boy, and the whole gang fall into a monster-infested world. With no memory, the boy shows he can control metal, and it's terrifying.