As the finale of the Happiness Trilogy, Perfect Happiness tells the love and life of several young soldiers in an air force in the north in the 1970s. Through this love story that happened in the military camp and spanned several decades, it evokes the audience's good memories of the past years.

An air force division in the north in the 1970s. Chen, the military affairs staff of the division, fell in love with Li Jing, a nurse who had just been assigned to the division hospital. Chen's sworn enemy's guard platoon leader was also attracted by Jing Li. The arrival of Jing Li turned Chen He, who was unconvinced, into a pair of potential rival in love. Zhu Daju is a martyr and an orphan.

Before her father died, Daju entrusted her daughter to her father, Deputy Commander Chen. In order to fulfill his promise, Deputy Commander Chen insisted on marrying Chrysanthemum, and they were like brothers. Director Song of the normal hospital where Chen's mother is located strongly opposes this marriage. In order to stop this marriage, Director Song went around looking for an object for his son.

Marisa from the Teachers' Art Troupe came into her sight. Li Jing was criticized for reading "poisonous books", while Hu Dayi took great care of Li Jing and took risks to help her find many books.

Excavate found great tiger's sincere feelings in his heart, and also saw his unique delicacy hidden under the rough and crazy appearance. The big boy walked into her heart with his unique breath and became a powerful spiritual pillar in her helpless life. Li Jing was sent to work with the medical team, and she went on the road with a deep and hazy love for Hu Da.