Netflix’s upcoming action thriller Mantis, a spin-off of the acclaimed Kill Boksoon, promises a high-octane dive into a chaotic world of assassins vying for dominance. The film introduces a stellar cast led by Yim Si-wan, Park Gyu-young, and Jo Woo-jin, who portray skilled killers entangled in a fierce competition for the top spot in a lawless hitman industry. New stills released by Netflix offer a glimpse into the intense dynamics and action-packed sequences that await viewers.
Mantis centers on Han Wool, played by Yim Si-wan, a top-tier assassin who returns to South Korea after a long hiatus, only to find the hitman world in disarray following the death of the industry’s CEO. Known by his nickname “Mantis” for his deadly precision, Han Wool wields his signature weapon in a fierce battle against rivals, as depicted in a striking still that captures him mid-fight. Yim Si-wan describes his character’s ambition, stating, “Offers from major companies keep coming in, but this Gen Z killer decides to start a new company with his friend Jae Yi and become the top figure in the industry. The director and I talked a lot about Han Wool’s relationships with Jae Yi.” This insight highlights Han Wool’s drive to carve his own path and the complex bond he shares with his fellow assassin, Jae Yi.
Park Gyu-young takes on the role of Jae Yi, Han Wool’s longtime friend and rival, whose talent matches his but is often overshadowed by his success. The stills showcase Jae Yi’s confident demeanor and relentless training, underscoring her determination to hone her skills and claim the No. 1 spot. Park Gyu-young shared her experience portraying Jae Yi, saying, “She is the strongest and most powerful character I’ve played so far. I felt she expresses her emotions more through action than dialogue, and I worked hard in action school to perfect the fight scenes in as much detail as possible.” Her commitment to mastering the physicality of the role promises dynamic fight sequences that will captivate audiences.
Jo Woo-jin embodies Dok Go, a retired legendary killer who returns to restore order in the chaotic assassin world. Stills of Dok Go reveal his commanding presence, whether he’s holding critical documents with a serious expression or fixing a sharp gaze on his surroundings. Jo Woo-jin reflected on his character, noting, “I wanted Dok Go to be an appealing old-school figure, someone trying to spark the last flame of his life.” His portrayal adds depth to the narrative, presenting Dok Go as a seasoned veteran navigating a new era of violence.
Director Lee Tae-sung praised the ensemble, stating, “I thought the combination of Yim Si-wan, Park Gyu-young, and Jo Woo-jin was the perfect mix. It was a casting as lucky as fate.” This harmonious blend of talent is set to bring the anarchic world of Mantis to life, with each actor contributing unique intensity to their roles. The stills emphasize the stakes of their rivalry, depicting a world where all rules have collapsed, and survival depends on skill and cunning.
The film’s premise, rooted in the power vacuum left by the CEO’s death, sets the stage for a thrilling exploration of ambition, loyalty, and betrayal. Han Wool, Jae Yi, and Dok Go represent different generations and philosophies within the assassin industry, making their clash both personal and professional. The released images capture the tension and physicality of their struggle, from Han Wool’s calculated strikes to Jae Yi’s disciplined training and Dok Go’s authoritative presence.
Mantis is poised to deliver a gripping addition to the Kill Boksoon universe, combining intricate character dynamics with visceral action. Fans of Yim Si-wan can also catch him in Summer Strike, while Park Gyu-young shines in A Good Day to Be a Dog, both available for streaming.
You can watch the trailer for Netflix's Mantis below:
Mantis is set to premiere on Netflix on September 26, 2025.
