Childhood friends Chen Ke Hai and Fang Li went their separate ways and found themselves in the No. 76 secret service. In 1939, the Bureau of Investigation and Statistics created a special class to combat the No. 76 of Wang Jing Wei's regime, with the hope of resisting Japan. Chen Ke Hai, now a secret member of the Communist Party, returns to Shanghai with the mission of infiltrating No. 76, where Fang Li is the leader. The brutal experiments reveal the truth about the bureau. Chen and Fang are separated after a failed assassination attempt. Facing a drastically different Chen Ke Hai, Fang Li tests him and places an agent at his side. Chen Ke Hai struggles to convey valuable information to his party without backing down. After the war, the former colleagues have a final confrontation over their contrasting beliefs.
In the 1990s, an armed police team in the south-western border of China encounter floods and drug traffickers while on a mission, resulting in heavy casualties. In order to avenge their dead comrades, the survivors launched a final confrontation against the drug dealers.
The story follows two modern women who deal with unemployment and typical day-to-day struggles. Da Yu meets Xiao Yu, a girl born in 1995 who has the same name and surname as herself. Xiao Yu had quit her job out of boredom and by coincidence, the two start living under the same roof. During the year that they are jobless, Da Yu follows Xiao Yu's lead in trying new things. In turn, Xiao Yu also learns to plan things under the influence of Da Yu. They decide to return to the workplace once more. Da Yu who's 30 hits a wall due to the stringent requirements in the corporate world and must find another way to move forward. Meanwhile, Xiao Yu learns to strive hard instead of taking it easy and earns the appreciation of her superiors. In this way, Da Yu and Xiao Yu find the meaning of life and work through each other.