ellow earth focuses on the story of a Communist soldier who is sent to the countryside to collect folk songs for the Communist Revolution. There he stays with a peasant family and learns that the happy songs he was sent to collect do not exist; the songs he finds are about hardship and suffering. He returns to the Army, but promises to come back for the young girl, Cuiqiao, who has been spellbound by his talk of the freedom women have under Communist rule and who wants to join the Communist Army.

Overview from themoviedb.org