Mantis

There is a specific, razor-sharp frequency that South Korean action cinema has tuned into lately, and it’s a frequency that sounds a lot like bone snapping against expensive upholstery. If you spent any time with 2023’s Kill Boksoon, you already know the vibe: high-fashion killers, a secret society with more corporate bylaws than a Silicon Valley startup, and a palette of neon-drenched bloodshed. Mantis (2025) takes that baton and runs—or rather, lunges—into the fray, proving that the "Boksoon-verse" has plenty of venom left in its fangs. I watched this while struggling to peel a particularly stubborn orange, and the contrast between my domestic ineptitude and Yim Si-wan’s lethal precision was frankly insulting.

A Sharp Blade in a Crowded Room

The film doesn't waste time holding your hand. We are dropped back into the world of MK Ent., the premier contract killing agency, but the pillars are crumbling. With the legendary Gil Bok-soon out of the picture, the hierarchy is in shambles, and the "rules" that kept the chaos contained have evaporated. Enter Han-wool, codenamed "Mantis." Yim Si-wan (who was so chillingly detached in Unlocked) plays the titular killer with a sort of terrifying, doll-like stillness. He’s not a brawler; he’s a surgical instrument.

What I find fascinating about this current era of streaming-first action is how it allows for these "side-quel" expansions. Mantis doesn't feel like a cynical cash grab; it feels like a necessary exploration of the wreckage left behind by the previous film. The story centers on the collision between the old guard and a "new generation of rising killers" who don't care about the romanticized honor of the blade. Park Gyu-young (phenomenal in Celebrity) provides a perfect foil as Jae-yi, bringing a frantic, modern energy that balances Han-wool’s coldness. Their chemistry isn't romantic; it’s competitive, like two predators trying to decide who gets the prime hunting ground. It’s basically a high-fashion runway show where the models occasionally disembowel each other, and I mean that as a high compliment.

The Geometry of Violence

Director Lee Tae-sung, who served as the assistant director on Kill Boksoon, clearly learned all the right lessons from his mentor Byun Sung-hyun. The action choreography here is less about "shaky-cam" realism and more about the geometry of the frame. There is a centerpiece sequence in a luxury high-rise—let’s call it the "Dinner Party Disaster"—where the camera moves with the fluidity of a ballroom dancer. The stunts feel physical and weighted; when a character hits a glass table, you feel the shards in your own skin.

I particularly appreciated the subversion of the "Puma Lee" character, played by Hwang Sung-bin. Usually, the heavy-hitter in these movies is a mindless brute, but the film treats his combat style like a brutalist art form. The sound design is the secret weapon here—the "thwip" of a garrote or the wet slide of a blade is amplified to the point of being a character itself. In an era where franchise fatigue is real, Mantis succeeds by keeping the stakes intimate. It’s not about saving the world; it’s about surviving the night and maybe getting a decent payout.

Streaming Shadows and Technical Craft

Released straight to streaming, Mantis sidesteps the box office pressure that often flattens the edges of big-budget action. This is a R-rated, unapologetic thriller that leans into its stylistic excesses. The cinematography by Kang Min-woo uses a lot of "The Volume" technology (those massive LED screens), but unlike some recent MCU entries where the actors look like they’re floating in a soup of pixels, the integration here is seamless. The lighting reflects off the leather jackets and the blood-spattered floors in a way that feels tangibly "real."

Interestingly, the film was shot under strict post-pandemic protocols, which forced the production to get creative with smaller, more contained sets. This actually works in the film's favor, creating a claustrophobic, "no-exit" feel during the climax. There’s a bit of trivia floating around that Yim Si-wan actually underwent three months of intensive silat and knife-fighting training, and you can see it in his posture. He doesn't look like an actor playing a killer; he looks like a man who has forgotten how to relax his shoulders.

Ultimately, Mantis is a testament to why South Korea is currently lapping the West in the "stylish thriller" lane. It understands that action is boring if we don't care about the person holding the knife, and it gives Yim Si-wan and Park Gyu-young enough room to breathe between the stabbings. It’s a slick, mean, and gorgeous piece of contemporary genre filmmaking that doesn't overstay its welcome. If this is where the Kill Boksoon collection is headed, I’m happy to stay in the shadows a little longer.

If you’re looking for a film that justifies your Netflix subscription this month, this is the one. It’s a mid-budget marvel that reminds us that sometimes, all you need for a good time is a sharp script and an even sharper blade. Just maybe don't try to peel an orange while you’re watching—you’ll feel far too clumsy.