One day, a woman bought a night-luminescent pearl to an antique shop and claimed to the owner (Qin Pei) that there was a great secret in the pearl. Afterwards, the woman was killed by an unidentified female killer (Wang Xiaofeng). Ming Tsai (Jacky Cheung) is a photographer. One day the owner of an antique shop asked Ming to take a picture of night-luminescent pearl, only to be found by a female killer who infiltrated into his house, killing the owner of the antique shop and robbing night-luminescent pearl. One day after work tomorrow, I met a beautiful woman, Hong (Zhong Chuhong), and fell in love with her at first sight. When he returned to the studio in the evening, he found the female killer dead in his studio, when the police had arrived at the scene of the murder. When Ming was desperate, he met Hong, Hong saved him, and was willing to help him find out the case. When Ming went back to get the film, he was robbed on the way, when the female killer appeared again. Hong pretended to help Ming distract the robber, but took the opportunity to cheat his negative. it turned out that they were in the same group. Ming is very forgetful, but still misses Hong very much. Later, by accident, Ming Ming found out about Hong's background and began to sympathize with her, so Ming decided to help Hong secretly as much as he could, and finally Hong was moved by what Ming had done.