This can't be considered a movie review, I think the plot is actually not that simple.
This movie is narrated from the first point of view of the heroine from beginning to end, which really lays a trap (for the audience) at the psychological level, because the psychological state of the audience and the heroine is the same, only Judging by one-sided things and experience.
In my opinion, the murderer is just like the title says, sometimes the less supporting characters appear, the more likely it is the murderer. That's right, you can see that the murderer is her husband's brother. But at the same time there is still a question, is the mastermind behind the scenes his husband? I don't think so. First of all, the male protagonist's domestic violence is not necessarily a fact, because this is just the female protagonist talking about it alone, and from the beginning to the end, she did not give her husband a chance to argue. And at the end of the film, when her husband saw her coming home, he was uneasy, like a boy on a first date. From these, it can be inferred that the male protagonist just scare her a little, and did not hurt her, while the female protagonist pretended to Poor ingredients are mostly.
From the beginning to the end of the film, there should be three sets of invisibility cloaks, the heroine, the hero, and the husband's younger brother. It should be obvious that the heroine and her husband's younger brother want to compete for his property, while the hero is just a victim. It's just that, the first thing the female protagonist does when he has an invisibility cloak is to get rid of the male protagonist.
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