As for the number of layers in the film, I think there are five layers.
In the first stage, the heroine is stabbed at the scene of the Z game; in the
second stage, the hero enters the game for the first time.
In the third stage, the hero and heroine enter the third stage when they are affectionate, where they kill the Chinese waiter.
In the fourth stage, the final shootout, the heroine kills the hero.
If the last scene is still in the game, it is the fifth stage. If it is reality, then the above four layers are the game world.
The open ending
PS. The heroine looks very much like my former friend (the only one, when single).
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