In a dilapidated corner of a city, elite police officer Tang Yue (Liu Ye) lives alone in an old building that is about to be demolished. He is waiting for his girlfriend Xu Ya (Wu Peirou) who has been missing for ten years to return. In order to find Xu Ya, he quits his job, but in the end he does not get any exciting news. "Find me, I will marry you", this is the message Xu Ya left for Tang Yue before she disappeared. It is like a riddle that can never be solved. Tang Yue is deeply trapped in it. On TV, Shao Yunfeng (Zhao Wenzhuo), the vice president of a foreign bank in China, and Bai Xiaoyun, the head of Bai Group, are chatting and laughing. Shao Yunfeng has a close relationship with Tang Yue. The female hijacker (Choo Ci Hyun) shot by Tang Yue ten years ago has become an unforgettable nightmare in his mind. Not long after, Bai Xiaoyun was brutally murdered, and her sister Bai Xiaoruo (Naza) found Tang Yue and asked him to track down the murderer, and promised to help him find Xu Ya in return. Who knew that Tang Yue actually saw the woman he shot at the beginning! The whole city is looking for...