Boon has described The Unholy Alliance as a Mission: Impossible-style[1] action thriller that features modern martial arts, including MMA, Brazilian jiu-jitsu, Krav Maga and gun fu.

With his best friend Tai Wah-koon pulling a few strings for him, Tsz-kit uncovers that his adoptive mother’s death is connected to Ling Hung, an Iron Lady running multiple syndicates, who is so powerful that her decision will lead to a profound impact on the economy and livelihoods of the communities.

Though Ching-yan and Tsz-kit join forces to strike back, they trigger a new wave of bloodshed that is about to engulf the whole society……[3] Producer Jazz Boon had always wanted to do a kung fu-themed production.

[6] After the commercial success of his 2014 television drama Line Walker, Boon was finally given the opportunity to conceive his own kung fu story with 2016's A Fist Within Four Walls.

Four Walls actors Grace Wong and Benjamin Yuen were invited to star, but declined the offer due to schedule clashes.