Killer film spin-off 'Mantis' explores rivalry beyond revenge

The movie 'Mantis,' a spin-off of 'Kill Boksoon,' expands the universe of professional assassins while shifting its focus away from vengeance. According to Yonhap News, director Lee Tae-sung layered the film with themes of youth, friendship, and rivalry as he sought to avoid the repetition of familiar genre patterns. The result is a work that blends sharp action with emotional storytelling, resonating well beyond the killer-film label.

Two contrasting prodigies and their bond

At its core, 'Mantis' introduces two assassins of opposite natures. Mantis, played by Im Si-wan, is an A-class killer with natural-born instincts, famed for fighting with dual sickles. His counterpart, Jae-i, portrayed by Park Gyu-young, embodies a different kind of genius-one built on persistence and tireless training with practice dummies until perfection became routine.

Their relationship, however, defines the film as much as their weapons. Lifelong companions turned rivals, they move between solidarity and fracture, their emotions fueling both friendship and rivalry. Lee Tae-sung drew inspiration for this emotional tension from the historical conflict between Mozart and Salieri, using their story as a narrative mold. By rooting each character's choices in personal emotion rather than revenge, the film provides a nuanced portrait of two prodigies wrestling with admiration, jealousy, and ambition.

Youth and growth as central themes

The decision to step away from revenge allowed Lee to reshape the narrative into what he describes as a pure, blank-slate exploration of youth. He recalled how his own friendships shifted over time, with youthful mistakes shaping the person he became. Reflecting that sentiment on screen, 'Mantis' portrays growth through trial and strain instead of triumph over an enemy. Even its elaborate fight sequences are informed by the characters' inner conflicts, making action a mirror of unresolved emotions rather than empty spectacle.

From assistant director to debut feature

Lee's creative journey with 'Mantis' stems from his work on 'Kill Boksoon,' where he served as assistant director. Experiencing the unique tone of that film led him to embrace the challenge of helming the spin-off. Collaborating with original director Byun Sung-hyun on the screenplay, he navigated the demanding transition from supporting role to main storyteller. By prioritizing originality, Lee intentionally avoided familiar revenge-driven arcs, choosing instead to convey stories of youth, mistakes, and personal bonds. For him, directing 'Mantis' was both a daunting test and a liberating opportunity to carve a distinct voice