Qin Xiaoyue discovered that her shared roommate Xiao Yun disappeared suddenly, but because of insufficient evidence, she did not attract the attention of the criminal policeman Wen Sheng. She decided to find Xiao Yun's whereabouts by herself, but was obstructed by her friend Li Zhongping. Yun was once the lover of Ma Zheng, the boss of Marriott Real Estate Company, and she holds the video evidence of Ma Zheng's shady dealings, which is hidden beside Qin Xiaoyue, but no one can find it.