1. The two heroines are close friends, but Mary's affection for Alice is like "grass snake gray line, along a thousand miles", has not confessed. But the two had already hinted when they drove. Mary observed that there was still "remaining makeup" on Alice's face, which showed that her love had been nuanced.
2. When Mary arrives at Alice's house, she has always shown a normal personality, but when she knows that Alice has a "heart belonged", her personality begins to split. Then
she fantasizes in bed, hate comes from her heart, her personality is completely transformed, and the "homicidal" is born; 3. Mary's homicidal personality dominates her to kill Alice's family, then kidnap Alice, and kill the cashier at the gas station on the road . And his normal personality is always accompanied as a third person.
4. In the greenhouse, Mary's two personality conflicts intensified, staged a self-fighting, and finally the normal personality prevailed. However, when she was scratched on her face by Alice, her personality changed again and killed the driver. The hatred born of love is so strong that Alice’s possessiveness becomes extreme, forcing Mary to confess her love. After hearing "I love you", Mary was softened by love, her personality recovered, and Mary pierced her back.
5. The camera returns to the mental hospital. From the stitch wound on Mary's back at the beginning of the film, it can be known that the film is a flashback. The whole incident happened in real, not imagined.
6. Killer personality and normal personality represent hate and love respectively.
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