The 29-year-old working man failed to achieve fame, and because he rashly took part in the drug test, he accidentally became a mutant of a fish head. Dreaming of becoming a social newcomer to report the truth and expose injustice, he was assigned to investigate the authenticity of fish men, which unexpectedly set off a wave of social unrest that shocked the whole country. The unemployment rate of young people is rising year by year, but there is nothing they can do about society. The emergence of fish men has become the spiritual sustenance of the new generation. However, under the operation of large enterprises and media, the wind ball of public opinion has flipped ⋯⋯again. Director Quan Wuguang boldly cut open the ugly aspects of contemporary society, satirized the media to create gods and demonize strange images, carefully explored the differentiation and opposition of the people, and packaged the cruel and cold-blooded human nature with absurd fables. The sad Song of Fish Man is like a demon mirror, reflecting today's chaotic and abnormal society, capturing the metamorphosis of capitalism with a fearless vision. Lee Kwang-soo, who became popular with the well-known Korean variety show "Running Man", played the leading role for the first time, giving a wonderful interpretation of the dazed generation facing difficulties.