"Changjin Lake". In the play "Changjin Lake", the US military was enjoying delicious food when suddenly artillery fire burst into the sky and was bombed repeatedly by the volunteers. "Changjin Lake" is a movie about the war to resist U.S. aggression and aid Korea. It tells the story of the Chinese People's Volunteer Army fighting against the U.S. military in the Changjin Lake area in 1950.