The story takes place in 1925, when zhong li (Tang Yan), a progressive girl inspired by the patriotic enthusiasm of the rejuvenation of the nation, signs up for a special training class during the first cooperation between the Kuomintang and the Communist Party, and is divided into a group with two girls, Luo Yifei (Wang Di) and Tan Ruiling (Lu Yi), and forms a deep friendship in the process of cruel training and mission execution. After entering the special operations group, because of a foreign assignment, Luo Yifei and Zhong Li turned against each other; the weak Tan Ruiling was used by Gao Yishan, the top commander of the special training class. Subsequently, the three girls successively entered the special operations team presided over by Gao Yishan (Zhang Xilin) and made significant contributions to the Northern Expedition. Unexpectedly, the Kuomintang quickly deviated from its original intention and began to eliminate dissidents, and Zhong Li had doubts about the justice of the action team. His boss He Yun (Hong Jingjing) sacrificed to protect Zhong Li, Zhong Li was greatly shocked and educated, in the most difficult environment, fought alone, protected a large number of progressive people, and repeatedly saved Luo Yifei and Tan Ruiling, exposed Gao Yishan's reactionary face, and helped them find the right direction in life. In the process, Zhong Li degenerated into a determined and enthusiastic progressive youth. In an operation, Zhong Li and his boss elite agent He Junfeng (Luo Jin) accidentally met, but the two people with very different personalities fatally burst out the spark of love; they are happy and wronged, and their daily lives are for no reason to pinch; they are also partners in life and death, mutual help at key moments without asking the reason, and they are born into death to complete one task after another
Zhong Li Actor: Tang Yan
Slightly neutral appearance, bold and frank, born chivalrous, do what is right, easy to fight and hold uneven, protect the weak, innocent and kind, the same heart, because of his special skills are valued, since then entered the secret agent training class, becoming a "agent who is the least like a secret agent". Zhong Li's impulsive and undisciplined personality often disrupts the deployment of missions, but he can always overcome dangers and magically complete missions, which makes his boss headaches and marvels at his secret service talent.
He Junfeng Actor: Luo Jin
Handsome and personable in appearance. He has stayed in the Soviet Union for many years, worked hard, is proficient in the most advanced international espionage technology, and is an elite strong general of the organization. He is a man of integrity, a man of great affection and righteousness, and he has been worried about his late fiancée for many years and has thoughts of him. Feeling freely, he always couldn't help but attach his gaze to the body of the alternative agent Zhong Li. For the sake of Zhong Li, he repeatedly broke the principle, and finally risked his life.
Tan Ruiling Actor: Lu Yi
Love is supreme; gentle as water, weak in appearance, gentle in temperament, exuding a special feminine charm between hands and feet. Women who can impress men, the overall quality of agents is average, but has a strong sense of survival, patience, and high psychological quality.
Luo Yifei Actor: Wang Di
The proud princess is competitive and never accepts defeat, but is good by nature, loves her mother to filial piety, and hates betrayal. During the training, he scorned Tan Ruiling's weak performance, admired Zhong Li's secret agent talent, regarded Zhong Li as his only friend, but unexpectedly created people, yin and yang, Luo Yifei was forced to replace Zhong Li to stay in Ying, did not see the last side of his mother and regretted for life. Luo Yifei regarded this as Zhong Li's "betrayal", and since then his friends have turned against each other and confronted each other tit-for-tat.
Xu Zhengfan Actor: Wei Qianxiang
Silent guardian, sunshine obsessive agent "Li Daren"; handsome and sunny on the outside, infatuated and gentle on the inside. After entering the special agent class, he liked Zhong Li, but due to the harsh regulations of the special training class, he had to put away his heart and silently guard Zhong Li's sunny smile.
Gao Yishan Actor: Zhang Xilin
The supreme commander of the special training class has a masculine charm, meticulous thinking, decisive action, under the appearance of calm. He even used his beloved to achieve his goal, but in the end he fell into disgrace.
Sun Weijun Actor: Kong Wei
The female instructor of the special training class with a variety of appearances and styles has a heart that is obsessed with love. Because of love, she lost her child; it was also because of love, she desperately tried her best and means, but in the end it was a void.