Shock Wave (2017)

An employee of the Explosive Ordnance Disposal (EOD) department, Chung Choi, infiltrated a gang of thieves led by Hong Kai Pan, who specializes in bombs. After working with his handler, Superintendent Zhou, and Kong Yu-Wai, the chief inspector of the regional crime department, on a cash safe robbery, Chang was killed by several of Hong's men, including his younger brother Hong. Kai-piu managed to arrest and successfully defuse the bomb without letting it explode.

However, Hong manages to avoid arrest, and he vows revenge. Six months later, Chang resumes his job at EOD and is soon promoted to the position of department head, where he meets and begins dating a recently divorced elementary school teacher, Carmen. A year later, Hung hired a group of mercenaries to deliver morphine and heroin to drug dealers in the Golden Triangle. provide him with a HK$50 million bail to seize the Cross Harbor Tunnel to force him to ransom it.