There are many small details in the movie that are easy to overlook, such as broken cups, broken mobile phones, half-bottles of potions, etc. The details are well set. After several rounds of action in parallel time and space, the protagonists finally realized the existence of "themselves" in several parallel times and spaces. When everyone except the heroine is no longer the original self, crazy thoughts also emerge in the heroine's mind to replace "self." The story becomes more thrilling and even terrifying when the heroine leaves the room on her own initiative. The reversal of the ending was unexpected to me. The back was cold, and the details of the ring on the hand were well set. But I didn't understand in some places. After the heroine killed herself, the body disappeared, or she didn't kill her.
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