Yesterday (11/21/2023) and this morning I watched Detention from 2020 again. It is the Taiwan series on Netflix that was based on the movie by the same name from 2019 that was based on the video game by the same name from 2017.
I enjoyed this series after the first viewing. I enjoyed it more the second time because I wasn't trying to figure out what was going on. There are scenes that take place in the past as memories that are intermingled with the present.
There is also a final scene after the credits. It's not a Marvel comics type scene where you say "Oh my god. The Green Goblin is coming back, and he's not even from this universe! What's that going to mean? (mind blown)" This end scene wraps up a couple loose ends. So if you watch the series, watch it through the end of the credits for the last episode.
The series is about a thirty year old school girl's spirit seeking revenge, gaining the trust of a young school girl with a type of brain anomaly (she sees and hears things) to enact that revenge. She takes medication to control her hallucinations. Remember, she sees this spirit. It is also about parents, their imperfections, and their children. It is also about forgiving oneself for mistakes, some deadly, from the past. It is also a tiny little romance. At the very end, it about the students of today being the future, and not the past of the adults. (There's a social cycle that bears remembering.) That part is maybe a little simplistic, but it is a commentary on Taiwan. One could say it is a metaphor for Taiwan, moving on from the government's mistakes from the past. Germany might understand, and someday the US might understand as well. Okay, it a story about hope, as nothing to do with vengeful spirit possession. (Now I've gotten cared away. it is definitely about spirit possession.)
I could probably watch the movie again, but I think the series has more depth and complexity, for me at least. i could be reading into it too much.