The One and Only (Cantonese)

Detective Kowloon (played by Zhang Jin) has a unique and ruthless style of investigation that often leads to remarkable success, making him an elite investigator in the Hong Kong police force. However, his authoritarian and explosive approach has led the police department to view him as a "paranoid man." Kowloon is assigned to investigate a series of murders involving young female police officers, but despite using all his methods, he finds no leads. Shockingly, his fiancée, the police officer Fang Ning (played by Deng Lixin), goes missing during the operation. As Kowloon struggles on the edge of love and pain, he suddenly realizes that the series of homicides is just the beginning; the killer has an even bloodier conspiracy, and both he and his fiancée have been ensnared in it. At this point, another murder of a female police officer occurs in Macau, with even more horrific methods employed. The killer seems to have intentionally left clues; is it a deadly trap or a glimmer of revenge? Kowloon sets out without hesitation, partnering with his friend Wang Mengqi (played by Liu Xinyou) and international boxing champion Xian Lishan (played by Anderson The Spider Silva) to collaborate with Macau's police chief Cao Zhide (played by Zheng Jiaying) in their investigation. With challenges mounting, blood must be repaid with blood! Even if it means shedding the last drop of blood, he vows not to rest until justice is served.