The main story of the "Meritorious Deep Dive" unit takes the deeds of Huang Xuhua, the chief designer of the first generation of nuclear submarine engineering, as the mainline of the story. Production director Li Peng said in an interview: Huang Xiaoming and Chen Hao have shaped the artistic image and life image of Huang Xuhua and his wife with professional performances, and demonstrated the spirit of the heroic figures who are sincere and passionate for their home and country with their "moisturizing and silent" performances. And this unit also condenses the service coordination of Qingdao Municipal Bureau of Culture and Tourism, Qingdao West Coast New District, Chengyang District and other relevant units. The Yushan Road Campus of Ocean University and the old site of the Qingdao Entrance Office Building on Guantao Road also appear in the play. Old buildings in Qingdao and the decommissioned nuclear submarine of the Naval Museum are even more important scenes in the film. A series of Qingdao elements add a sense of intimacy to the solemn and grand theme of "Merchants".