The story takes place in a beautiful coastal city. The protagonist, Lao San, is a retired navy. He always maintains a military style at work and stands up to bad phenomena. He accidentally encounters a robbery gang led by Hei Yong. Just when the gang is committing a crime, Lao San stands up to uphold justice. Finally, under the crackdown of public security personnel, the criminals are brought to justice, and Lao San also gains love. The film shows the fierce and vigorous fight of public security officers and retired sailors against evil forces. While praising their iron will, it also shows their extraordinarily tender side towards their loved ones. The characters in the film are distinct, the plot progresses with ups and downs, the conflict and confrontation in the story are well done, and the genre style is strong. It is a commercial genre film that combines ideology and entertainment well.