Cliff

In the late 1930s, the ancient land of China was experiencing the most painful moments. There are Japanese invaders attacking with iron hoofs outside, and there are conflicts between different factions inside. The war continues and the lives are devastated. In order to obtain important information, the Communist Party sent Zhou Yi (played by Zhang Jiayi) and Gu Qiuyan (played by Song Jia) to pretend to be a couple and sneak into the Special Agent Section of the Harbin Police Department. Zhou Yi was appointed captain of the special operations team, but his true identity has been suspected by Section Chief Gao (played by Cheng Yu). Underground work is full of dangers, and you will lose your life if you are not careful. Zhou Yi misses his separated wife, and Qiu Yan, who is pregnant, is worried about the child in her belly and misses her husband. However, for the sake of their common ideal, they have to suppress all the emotions in their hearts and walk hand in hand in this corridor full of darkness, just for the bright light ahead...