The chief investigator of ICAC, Chan King-chi, learns that his childhood friend Hui Chik-yiu is working as a spy for a smuggler company after Hui mysteriously flees to Australia. Despite knowing everything Hui does, Chan's failure to officially record and register Hui's activities renders all evidence useless in court. This mistake ultimately leads to the downfall of the ICAC team's efforts, as the manipulator behind the smuggling scheme kills off their witnesses.
Integrity
A childhood friend of the chief investigator goes undercover to take down a smuggling ring after their friend's sudden disappearance and escape to Australia, embarking on a dangerous spy mission.
