The most heart-breaking, depressing, horrific and raw piece of cinema I have ever witnessed. I have never sobbed like that over anything, even when the movie was finished, it didn't leave me. This movie was absolutely flawless, the main leads and supporting cast were impeccabile, the cinematography, execution was all perfect. It pulled me in from the first scene, and even though so parts were impossible to watch, I had to continue. Gong yoo was absolutely perfect as the main protagonist, I have a huge problem with movies like this where they have a superhero-like character come in and safe the kids from the horrible people. Gong makes the character so relatable, he isn't trying to save lives but does what I think majority of people in that situation would have done making it very realistic, and does so without shouting and screaming too much - he manages to show every single emotion with just a look on his face. The kids, *sigh* the little boy particularly, I want to give him an oscar for his performance. I mean wow. I would say only watch this movie if you have a very strong stomach for things like this, and it will surely leave a huge impact on you. Only reason I rated the re-watchability a "2" was because I really could never watch it ever again.