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Why do we call people who don't do their jobs "prodigal sons"

In the Northern Song Dynasty, there was a prime minister named Li Bangyan. Although he is talented, elegant and talented, he doesn't do his job. He likes to sing music and play football. People in the capital call him the Prime Minister of prodigal son. Therefore, later people referred to the young people who were idle and idle as "prodigal sons" and those who had corrected their evil ways as "prodigal sons turning back.".