Great movie, super interesting topic but don't watch it if you're feeling down or pretty sensitive, I felt like crap afterwards. It's not too explicit but this is a really depressing movie, especially since it's loosely inspired by a true story, and that's def not a wholesome feelgood movie.

The way the movie is written and directed is interesting. We switch perspective halfway through the movie.
It is quite slow paced and you feel like how hard it is for the characters to go through their days.
From what I recall, there's not a lot of background music but the lack of it contribute to make the ambiance heavy.

If you are interested in how hard training program and work culture for young people is in Korea, that's for you but brace yourself, that's a bumpy and painful ride.

PS: Sorry if some sentences sound weird, English is not my first language.