Hong Kong Forensic Science Department Senior Chemist Gao An (played by Huang Haoran), Forensic Science Department Senior Doctor Wen Jiaxi (played by Li Shihua), West Kowloon Serious Crime Unit Senior Inspector Guo Huihuang (played by Tan Junyin), this "Crime Fighting Iron Triangle" leads an elite team, using professional forensic science to reveal the amazing premeditated plan; using sophisticated forensic knowledge to crack the hidden human body code; using rigorous law enforcement spirit to disclose the shocking truth of the crime! Passionate reporter Xu Yi (played by Tong Luowen), childhood regrets are closely linked to Gao An; forensic expert Shui Huiming (played by Chan Wai), betrayed by her beloved, suddenly became a murder suspect; police elite Gao Jing (played by Zhu Chenli), persevered in pursuing the truth of her relatives being abducted... Mysteries and strange cases, intertwined; cold-blooded murderers, shocking scenes! People do, God is watching! The "Crime Fighting Iron Triangle" adheres to the belief that "evil cannot defeat good, evil cannot defeat good", and vows to speak for the dead and redress the injustice of the living!