The broken hand is a metaphor for the protagonist himself. It strives to pursue the master's body. In a sense, it hopes to return to the original beauty and make up for the shortcomings of the year.
In the flashback, we learn that the protagonist had a happy family when he was a child, but he fell terribly due to a car accident. When I grew up, I fell in love with a girl, but it ended in failure. All kinds of misfortunes make the protagonist nostalgic for the past and unable to let go.
When the film ends, the severed hand finally returns to the master, but he cannot connect himself to the master. At this time, I realized that if I lost my hand, I lost it, and I can't get it back. Rather than connecting, sharing memories and witnessing the master's progress may be a better choice.
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