In the second half of the film, Paul's insight on the train reveals the theme of the film:
"It's not easy to go astray in the journey of life. It's like someone always opens the door to another world. If you're not careful, you may walk in. Then you die. . That's why you're in a dream and you're standing in the doorway, and dying, born people pass by you. As they come in and out of the world at night, they make you revisit your life again and again. You make you It took you a long time to find your way back to your world."
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