This contains spoilers but I just have to air my thoughts. Initially, I would've scored this a 7 but after watching it again, somethings made full sense. So I'm scoring it an 8.5

I didn't realize that the epilogue was from the further past. Probably the ones where they just really discovered the basement. This is all a repetition. They have been subjects of the experimentation for quite some time now. This is why Juran seems to be really detached with her family because it's not her real family at all. When Shizuko and Kazue accidentally watched the film, it is revealed that they were part of the very first test groups and their memories are just wiped out. This is further proven when the girls embroidered the life teacher and one of the students were suddenly surprised about what happened the next day.

The superhero strength of Juran didn't happen all at once. It was a fruit of her being years in their. She probably needed to be sent out the last time because of health complications, but now that she is back to the program, she is again exhibiting the same numbness and super strength.

I love and hate that this is an intelligent movie. It was just a lil jarring when you think about the build up as horror, but I enjoyed it during my rewatch.

Boyoung and Sodam are exceptional. They say this is subtly a lesbian film but I fully believe that Juran, Kazue and Yuka were friends ever since and they are always leaning towards each other despite the memory loss.

Will probably watch again after a few years.