Line Walker

Cheuk Hoi, a seasoned chief inspector with Hong Kong's Criminal Intelligence Bureau, grows uneasy after the sudden death of a trusted colleague. As he probes the case, a tougher truth surfaces: five undercover agents who stayed in touch with the fallen officer have vanished without a trace. The investigation drags him into a murky network where loyalties shift and every lead raises more questions than answers. With the clock ticking and colleagues whispering about cover ups, Hoi must weigh what he owes to the public against what he owes to people he thought he knew. The show builds a taut atmosphere of suspicion where danger can hide behind ordinary relationships.

Line Walker premiered in 2014 as a TVB crime drama created by Tommy Leung Ga-Shu. It presents an original concept, with direction credited to a TVB production team rather than a single auteur.

Among Hong Kong crime thrillers Line Walker stood out for its grittier portrayal of undercover work and the strain it puts on personal ties. The ensemble led by Michael Miu, Benz Hui, Benjamin Yuen, Priscilla Wong, and Raymond Lam drew strong fan engagement and sparked conversations about trust.

It received generally positive reviews for tight pacing and solid performances, with many viewers noting its mature take on loyalty and deception. Core themes include the erosion of trust, the cost of secrecy, and how identity shifts when people wear a false front.