Policewoman Yiu Chi-yue is a natural born Highly Sensitive Person. She brings chocolate, salty lemon water and a brain with an “on-off switch” with her whenever she investigates cases. Her senses are heightened when she drinks salty lemon water that arouses her keen awareness of clues at the crime scene. Through touching the dead body, gathering evidence and her senses, she empathizes with the victim and reconstructs the sequence of events. Since Chi-yue met restaurant boss Wong Mik-kei, the duo are no longer “spectators”. Perpetrators at large are killed one after another. Chi-yue covertly challenges some serial killer on several occasions, and their true identity is gradually uncovered. Chi-yue realizes the two of them have conflicting standpoints even though they are like-minded, causing her to face the conundrum of making life choices. In the meantime, Mik-hei astonishingly makes some decision for her.
Mainland-born Liang Huan came to Hong Kong with her daughter Li You Hao in the 1980s to be reunited with her husband, Li Gao Shan. However, he dies unexpectedly, leaving Liang Huan to fend for her late husband's teahouse.
Senior Inspector Wai Ging Seng of the West Kowloon Crime Unit and Ho Wai Lim, Senior Investigation Officer of the Hong Kong ICAC meet unexpectedly in the process of arresting a murderer. After being framed, hunted down by killers, and turned against their partners, they join hands to surface a corruption force that includes almost the entire top-level social network in Hong Kong.
Two police officers, one black and one white, each for their own way of justice, embarking on a confrontation of death and death.
Shiga Lin Si-Nga (born 29 June 1988) is a Hong Kong singer and actress. She is currently signed to Warner Music Group, Hong Kong.