In the year 1941, Nazi Germany declares war against the Soviet Union. Given that Manchukuo's loyalties lie with Cheng Tian, the Russians are caught in a situation where they face threats on all sides. Their intelligence agency devises a long-term plan in secret. Communist spy Tang Fei (Liu Yunlong) receives a mission to infiltrate the enemy by pretending to be one of their own. At the Security Bureau, he crosses paths with Cai Meng (Han Chae Young), a woman determined to fight against the Japanese regime. They gain each other's trust as they try to outsmart the enemy within their own territory.

An Ni, a prosecutor of the Jiangcheng Procuratorate, was assigned by Chief Prosecutor Xu Ailin to handle the case investigating a missing college student who jumped off into a lake. She started with Zhao Jikai, the General Manager of Huiquan Games, and found connection between him and overseas organizations that promote bullying, leading to the arrest of the crime perpetrators. While Huiquan Games’ stocks price plummeted, Yin Huiquan donates to Jiangxiao Academy which would in turn corrupt minors in the guise of charity. The student Li Xiaowen and other victims come forward, publicly denouncing the unorthodox means of Jiangxiao Academy to control youngsters. An Ni presents solid evidences in the court, leading to the academy’s shut down and punishment of those who were involved. Yan Qin, who took over the Huiquan Games, misappropriated the funds to invest in the development of a copper mine. However, this investment venture was a Ponzi scheme by an online financial fraud gang.

Lin Xi Chi is a college student majoring in veterinary medicine. She is well-liked and known for being bright and cheerful, although, on the inside, she is more insecure than she would like to let on. Also attending the same university is her childhood friend, avid archer, and national defense student Xu Fang. He has had a crush on Lin XI Chi since they were both at school but has never plucked up enough courage to let her know. Although he can be quick-tempered with others, he always treats Lin Xi Chi with great tenderness.

Zheng Yao-Xian is a CCP spy code-named Kite and lurks in the Nationalist secret service.