Spoiler alert……
Don’t watch the last episode. It was good for the first few episodes.
But starting from Mr Lee was died out of nothing the series started to go to a weird direction. Sudden disappearance of Won Bin. We keep thinking we might miss an episode, and the kids started to grow strong but suspect each other. The scenes are totally random, and then with all the effort of fighting against the spheres all of them are died because of ONE crazy student??? It doesn’t make any sense and totally random and a waste of time. Very heart wrenching and disappointing ending.