Netflix’s highly-anticipated action film Mantis, a spin-off of the acclaimed Kill Boksoon, is set to captivate audiences with its high-octane action and stellar cast. The film, starring Yim Si-wan, Park Gyu-young, and Jo Woo-jin, is slated to premiere on September 26, 2025. A newly released making-of video from Netflix Korea offers an exciting glimpse into the intense preparation and dedication behind the film’s breathtaking action sequences, showcasing the cast’s commitment to delivering a pulse-pounding cinematic experience.
The behind-the-scenes video highlights the meticulous effort invested in Mantis’s action choreography. Yim Si-wan, who plays the titular assassin Han Ul, and Park Gyu-young, portraying his rival Jae Yi, underwent rigorous training at an action school to master the film’s demanding combat scenes. Their preparation included hand-to-hand fighting techniques, weapon handling, and intricate wirework to execute gravity-defying stunts with precision. The video captures the actors’ focus as they hone their skills, ensuring every movement aligns seamlessly with the film’s intense narrative.
Jo Woo-jin, who takes on the role of Dok Go, a retired legendary killer, is also featured prominently in the footage. On set, both he and Yim Si-wan are seen tirelessly rehearsing their fight choreography, perfecting every punch, kick, and stunt to achieve flawless execution on camera. The actors’ dedication to authenticity is evident, as they push their physical limits to bring the chaotic world of Mantis to life. The video underscores the collaborative effort between the cast and the stunt team, highlighting the level of detail and professionalism that defines the film’s action sequences.
What is Netflix's Mantis about?
Mantis follows the story of Han Ul (Yim Si-wan), a top-tier assassin known by his codename “Mantis,” who returns to the hitman industry after a prolonged hiatus. Upon his comeback, he finds the once-orderly world of contract killing in disarray, with new players and shifting dynamics. Han Ul crosses paths with Jae Yi (Park Gyu-young), a fellow trainee turned fierce rival, and Dok Go (Jo Woo-jin), a retired but legendary figure in the assassin world. As the trio navigates this anarchic landscape, they find themselves locked in a high-stakes competition for the coveted No. 1 spot in the industry. The film promises a thrilling blend of intense action, complex rivalries, and gripping drama, set against the backdrop of a cutthroat underworld.
The Star-Studded Cast of Mantis
Yim Si-wan, known for his versatile performances in dramas like Summer Strike and Misaeng: Incomplete Life, steps into the role of Han Ul with a commanding presence, bringing both intensity and nuance to the character of Mantis. Park Gyu-young, celebrated for her work in A Good Day to Be a Dog and Sweet Home, embodies Jae Yi, a formidable adversary whose chemistry with Han Ul adds depth to their rivalry. Jo Woo-jin, a seasoned actor recognized for his roles in The King and Narco-Saints, delivers a powerful performance as Dok Go, the retired killer whose return shakes up the assassin hierarchy. Together, this trio anchors Mantis with their dynamic performances, elevating the film’s action-driven narrative.
The release of the making-of video has heightened excitement for Mantis, offering fans a tantalizing preview of the film’s adrenaline-fueled action and the cast’s unwavering commitment. As the premiere date approaches, Netflix continues to build anticipation for this Kill Boksoon spin-off, which promises to deliver a fresh take on the assassin genre with its compelling characters and meticulously crafted fight scenes.
Mantis will be available to stream on Netflix starting September 26, 2025. In the meantime, viewers can catch Yim Si-wan in Summer Strike and Park Gyu-young in A Good Day to Be a Dog on Netflix to get a taste of the talent driving this upcoming blockbuster.
