What is the allusion to the sentence "Homesickness is empty, and I feel like a rotten Ke when I go to my hometown"?

Wendi Deng means to miss the old man. Xiang embroidery, a native of A Jin, passed by the former residence of Ji Kang and Lu An, and heard his neighbor playing the flute, so he wrote "Thinking of the Old";

Michelle people: Jin Wang Jinshan collected firewood and watched people play chess. He finally found that the handle of his axe was rotten, and when he got home, he realized that one hundred years had passed.

This image expresses the poet's inner sadness and disappointment when he came back after being demoted for 23 years, many old friends died, and personnel changes in the DPRK and China.

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