It was his sister. Not really a sister. The girl's father was captured by Nationalist soldiers during the civil war and she was taken care of by another man, that other man was also taking care of a boy and they became brothers and sisters. The girl meets her real father on the battlefield, her father still serves the PLA as a general.Originally Posted by T-U-P
Oh and she not only sung, she was also a soldier and was fighting but mostly singing. The movie is black and white so it is pretty old.