Honestly, I watched this movie because I was looking for Choi Woo Shik works and honestly this movie didn't fail me.
Nothing in this movie is missing, maybe a part 2. I believe there are still pieces left to watch of this movie but the storyline per se really really really involves who's watching. Making the viewer feel every single thing that happens.
Loved the cast a lot and I really enjoyed listening to the movie soundtracks a lot. It was like a way to hypnotise me and tell me "Watch me again." I've watched it like a lot of times already.