The son of a wealthy man in the city, Fang Junlang (played by Tam Chun-yi), was kidnapped. CID agent Zhao Zhanlong (played by Bosco Wong) relied on a clue and endless energy to track down the kidnapper, Dai Shaonan (played by Tang Jianwang) to the hotel. During the investigation, he met a female reporter, Tang Jing (played by Zheng Xinyi). Because of her recklessness, Zhanlong was in a mess. There was no breakthrough in the case, but because a foreign guest in the hotel was diagnosed with "new influenza", the entire hotel was ordered to be immediately blocked and quarantined by the authorities, and Zhanlong was forced to be trapped in the hotel. The hotel was originally scheduled to hold a jewelry auction. The thief couple Yi Zaoan (played by Ma Junwei) and Wang Jiayu (played by Sonija Kwok) entered the hotel under the false identities of a Thai overseas Chinese businessman and a Shanghai rich lady, respectively, coveting the diamonds in the hands of the Mala jewelry merchants Xu Fusheng (played by Yu Yang) and Qian Jiayan (played by Lin Yiqi). However, the hotel was quarantined, and the incident happened suddenly, causing the treasure-stealing operation to fail, and the two were also trapped in the hotel. During the quarantine, Zhan Long was assigned to share a room with Zao An. To facilitate the investigation, Zhan Long had to conceal his identity and claimed to be a fitness coach to Zao An. Thus, a soldier and a thief were forced to live in the same room...