On the Edge

After working as an undercover in a triad for 8 years, Sheng finally arrests the triad leader and resumes his duties as a police officer. However, life does not return to normal as he is faced with suspicions colleagues and even trailed by the investigations team. One day, he meets some triad members whom he has earlier befriended as an undercover agent and is forced into a corner when asked to collaborate with them once again.

Nick Cheung

Harry Sin

Francis Ng

Don Dark

Anthony Wong

Lung

Rain Li

Cat

Derek Tsang

Mini B

Calvin Poon Yuen-Leung

Jimmy

Lester Chan

Mr. Cheung

King-Man Chik

Amy

Pauline Yam

Madam Ho

Sau-Ming Tsang

Sam

Eddie Pang

Buddy

Ming-Sing Wong

Dave

Y.Y. Lam

Kitty, Dave's Girlfriend

Wong Ting Pong

Internal Investigations Office Constable

Sze-Ming Lu

Tsu

Frankie Chin Chi-Leung

Hon