The
Foreigner

The film is based on The Chinaman, a 1992 thriller novel by British-Irish author Stephen Leather. The book follows a similar premise — a Vietnamese man whose daughter is killed in an IRA bombing methodically pursues the bombers — though the novel's political and personal details differ from the film's adaptation in several respects. The novel's original title was considered unsuitable for the film's international marketing and the production retitled the adaptation The Foreigner. Leather is a prolific thriller writer best known for his Dan Shepherd series of special forces novels; The Chinaman is one of his earliest standalone works and had been in development as a film project for years before Martin Campbell and Jackie Chan became attached.

Campbell has spoken in interviews about the extensive rehearsal process he undertook with Chan ahead of production — particularly for the film's purely dramatic scenes, which were the furthest outside Chan's comfort zone. Campbell worked with Chan on the specific physical and emotional grammar of grief: how a man who has suppressed trauma for decades carries it in his body, how that suppression breaks down under fresh loss, and how the transition from civilian to operative reads on screen without melodrama. Chan reportedly found the process of playing sustained grief difficult — not because he lacked the emotional capacity but because his instinct under pressure is always to find the physical solution rather than sit with the feeling. Campbell's direction consistently brought him back to stillness. The results speak for themselves.

Fan is played by Katie Leung, a Scottish actress of Chinese descent best known internationally for her role as Cho Chang in the Harry Potter film series (2005–2007). Her appearance in The Foreigner is brief — Fan dies in the opening bombing sequence — but her presence in the few minutes of screen time she occupies is warm and specific enough to make her death feel genuinely devastating rather than merely plot-mechanical. Leung has continued to work steadily in British television and film since Harry Potter; her casting in The Foreigner was noted as a smart piece of audience expectation management, as viewers familiar with her work arrive with pre-existing warmth toward the character she plays.

The film is a mainstream thriller rather than a documentary, and its portrayal of IRA splinter factions and Northern Irish republican politics is a simplified but not entirely inaccurate portrait of the tensions that persisted in certain communities after the 1998 Good Friday Agreement. The concept of an "Authentic IRA" splinter group — republicans who rejected the peace process and continued to regard armed struggle as legitimate — reflects real-world dynamics: dissident republican groups including the Real IRA and Continuity IRA continued to operate after the Agreement. Hennessy's position — a former combatant turned constitutional politician with ongoing ties to people who have not made the same journey — also reflects a real and ongoing complexity in post-Agreement Northern Irish politics. The film handles these nuances more carefully than most Hollywood thrillers would bother to.