Season
- Season 1 2017-09-18
Episode
- Episode 1: Episode 1
- Episode 2: Episode 2
- Episode 3: Episode 3
- Episode 4: Episode 4
- Episode 5: Episode 5
- Episode 6: Episode 6
- Episode 7: Episode 7
- Episode 8: Episode 8
- Episode 9: Episode 9
- Episode 10: Episode 10
- Episode 11: Episode 11
- Episode 12: Episode 12
- Episode 13: Episode 13
- Episode 14: Episode 14
- Episode 15: Episode 15
- Episode 16: Episode 16
- Episode 17: Episode 17
- Episode 18: Episode 18
- Episode 19: Episode 19
- Episode 20: Episode 20
- Episode 21: Episode 21
- Episode 22: Episode 22
- Episode 23: Episode 23
- Episode 24: Episode 24
- Episode 25: Episode 25
- Episode 26: Episode 26
- Episode 27: Episode 27
- Episode 28: Episode 28
- Episode 29: Episode 29
- Episode 30: Episode 30
Line Walker: The Prelude Season 1 Episode 22
In 2010, Cheuk Hoi secretly travels to Bangkok to conduct a drug operation with his undercover agents in Thailand. As they finish their mission and are about to leave Thailand, an explosion causes all of Cheuk Hoi's undercover agents to die in a sea of fire. At the same time, Cheuk Hoi's good friend, CIB Inspector Lai Sir, is killed for unknown reasons, leaving Cheuk Hoi in charge of a female cop who is not yet officially an undercover. Cheuk Hoi knows that Lai Sir still has undercover agents whose identities have been deleted. To learn the truth about Lai Sir's death, Cheuk Hoi must find all of the undercovers. He and Suk Mui begin to search for the undercover agents.
