Series from 2017
When undercover agents are exposed, police officers must work to defend their fellow agents while dealing with corrupt officials.
In 2010, Senior Inspector CHEUK HOI from the Criminal Intelligence Bureau (CIB) of the Hong Kong police force heads to Bangkok, Thailand, commanding the covert agents he dispatched there to investigate a Hong Kong drug lord.
Due to their declining influence, NGAI TAK-SHUN, the son of NGAI CHUNG-SHAN who is the leader of a Hong Kong triad society, Cheung Hing, returns with a bang to take over the gang and starts cleaning house.
Having recruited a top hitman named CHAI FING, FOON-HEI goes to elaborate lengths to ambush TAK-SHUN, but the attempted assassination fails because TAK-SHUN, as a military veteran, manages to escape.
CHEUK HOI and SUK-MUI are performing surveillance in Thailand in hopes of finding those covert agents that are with FOON-HEI but they have lost contact with. At that time, it’s confirmed that one of PAK-KEY’s confidants is their lost covert ag
SIU-FUNG knows that PAK-KEY lost the drugs that were initially stolen by TIN-TONG, and the buyer is seeking revenge. To protect PAK-KEY, SIU-FUNG decides to secretly kill FOON-HEI.
TAK-SHUN and KA-LEI work together, using a high-end club as a façade to cover up their money laundering business; whereas SUK-MUI manages to land a job at the high-end club as a waitress, seeking to take the opportunity to investigate Cheung Hing
