The film deals with Kim Yu Bong who was collier at the February 8 Jiktong Youth Coal Mine. He made his life worthwhile with his pure conscience and through his dedication at a difficult and labor consuming post.

Working hard for several decades since he volunteered to do at the coal mine, the hero of the film devotes himself to increasing the coal production to live up to the love and trust shown by General Secretary Kim Jong Il for him as putting forward him, an ordinary coal miner, as deputy to the Supreme People's Assembly and Labor Hero.

He, secretary of a cell of the Workers' Party of Korea, takes care of the work and life of coal miners with revolutionary comradeship and warm human feelings and brings up young coal miners as reliable masters of the mine with principle as a real mother would do.

He breathes his last after saving the coal cutting face from danger but he is always remembered by Kim Jong Il and the people.