Jeon Jong-seo is the reason to watch. As Young-sook she shifts from lonely victim to giggling, unpredictable killer, and every scene she is in crackles with danger. Park Shin-hye is strong too, playing a woman who keeps trying to fix things and keeps making them worse.
The best idea is the house itself. Each time the past is changed, Seo-yeon's present changes around her: walls decay, rooms repaint themselves and people vanish, sometimes within one camera move. These shifts are clever, eerie and very well made.
The film starts as a moody mystery and turns into a cat-and-mouse thriller where the killer can attack the past. The rules are mostly consistent, and the tension keeps building. It is violent in places, with stabbings and burns, but the horror is mostly about helplessness.
It runs a little long, and the middle has a few repetitive phone calls. But the final act, and the scene after the credits start, make this one of the most talked-about Korean thrillers on Netflix.
