Bai people
In 1945, Zheng returned to Korea or, precisely, North Korea, where he worked as chief of the North Korean army's band and taught music at Pyongyang University. Zheng wrote the anthem of the North Korean Army, Tumen River, East Sea Fisherman and other songs. After the outbreak of Korean War, Zheng returned to China, where he composed many works including a Chinese-language western-style opera, "Cloud Gazing" based on a story of the Bai people.