I get that it was the parent’s revenge for their daughter but having them in the timeloop can eventually kill everyone.

At some point, they need to understand that Yoon-Seo winning was Se-Eun trying to help her survive.

It was also unfair that the others in the class may not have known about the video or i would say “innocent” from Se-Eun’s death.

I almost thought that the parents are somewhat sadistic, idk

but a better ending would be that they have watched all of the things that they did during the game and everyone eventually wakes up with the parents explaining the game.