[6] Ting Cheuk-fei (Michael Tse) is an undercover police officer who has been infiltrating the Fuk Wo (福和) triad gang for seven years.

In order to keep his cover, Ting is more ruthless than other triad members and helps him gradually get closer to his goal.

On the other hand, Tuen Yat-fan (Pakho Chau) work for drug lord Sung Ching-kwong's (Kenneth Chan) who was planted mole in the Hong Kong Police Force.

Tuen also successfully proposes to his girlfriend, Sin-yeung (Shiga Lin), who works in the unit's interior department, and longs to become a real policeman.

On the other hand, Ting is picked by Fuk Wo main leader, Brother Hei (Benz Hui) along with two other fellow triads to execute the trade.

Production for The Infernal Walker took in Hong Kong in 2019 and wrapped up in early April of the same year, where a celebration banquet was held in Knutsford Terrace, Tsim Sha Tsui.

[12] Edmund Lee of the South China Morning Post gave the film a score of 2.5/5 stars, praising Michael Tse and Pakho Chau's performances and director Ally Wong in keeping the narrative diverting, but criticizes the choppy editing and underdeveloped characters.