A solid action thriller about a man who wakes up after an accident to find out he's not the person he used to be. To make matters worse, it turns out he'll "transform" into someone else every 12 hours.
The sci-fi gimmick is mostly used for a Bourne-style recipe; for every bit of mystery that the protagonist manages to clarify we get a round of fistfights, chases or shootouts. I wish that the film did more with its concept but it still manages to entertain throughout its runtime. There's almost no need to highlight the film's cinematography as it is as polished as we've come to expect from Korean thrillers. The last action scene is obviously heavily inspired by John Wick, but that doesn't take away from its intensity and well-done choreography.
Recommended for fans of high-concept Korean thrillers; however, they might need to lower their expectations a bit since this isn't really a top-tier pick in the genre.