A brigade of five marines are sent on a dangerous mission to capture an enemy stronghold during the Korean War.

Jo Doo-soo, a member of a gang, comes across and helps Joanna, a college student who is about to have her handbag robbed by the bullies on her way home. Joanna is a diplomat's daughter and living the life of the upper class; whereas, Jo Doo-soo wastes his days serving the gang. Attracted to one another because of their opposite lives, Doo-soo and Joanna quickly fall in love. Being a devout Christian, Joanna believes that if only Doo-soo changed his thoughts about the way he lives, he could be a new person...