Guo Jingran was reborn and returned to Songhu in 1943. He became a traffic officer at the lowest level of the Shanghai Juntong Station. His task was to monitor his newlywed wife Zhong Ruoqing. He wanted to protect his lover from the whirlpool, but he was shocked to find that the person next to him was a senior Japanese spy codenamed "Nightingale". When pretense meets pretense, and trials intertwined with temptations, how can this marriage that began with conspiracy perform a pas de deux of faith and affection on the tip of a knife?