The opening shot of Black Knight lingers on a gas mask, its lenses fogging up as the wearer exhales—a stark, immediate reminder that this isn’t your typical action series. Set in 2071, Cho Ui-seok’s dystopian drama drops us into a world choked by air pollution, where survival hinges on the Black Knights, a ragtag team of deliverymen who ferry precious oxygen to desperate citizens. It’s a premise ripe with potential, and for the most part, Black Knight delivers.

The series thrives on its world-building, painting a grim but compelling vision of Seoul under siege by toxic air. The production design is meticulous, from the cluttered, makeshift respirators worn by the impoverished to the sleek, armored trucks of the Black Knights. Kim Woo-bin’s performance as ‘5-8’ anchors the show, his quiet intensity and physicality lending weight to a character who’s more than just a courier—he’s a reluctant hero navigating a morally gray landscape.

The action sequences are visceral and well-choreographed, with director Cho Ui-seok favoring tight, claustrophobic shots that amplify the tension. One standout moment is an ambush scene where ‘5-8’ and his team are cornered in a narrow alleyway; the camerawork and editing create a pulse-pounding sequence that feels both desperate and exhilarating.

However, Black Knight stumbles when it tries to juggle its various subplots. The series occasionally veers into melodrama, particularly with the romantic tension between ‘5-8’ and Jung Seol-a (Esom), which feels underdeveloped and tacked on at times. Additionally, the pacing falters in the middle episodes, where the narrative gets bogged down by political intrigue involving President Chae Jin Kyung (Jin Kyung) and Chairman Ryu Jae Jin (Nam Kyung-eup). These subplots, while relevant to the larger story, often slow the momentum without adding enough depth to justify their length.

The supporting cast is a mixed bag. Song Seung-heon as Ryu Seok brings gravitas to his role as a high-ranking official with questionable motives, but Kang You-seok’s Yoon Sa Wol feels underutilized, his potential as a morally conflicted ally often overshadowed by the central duo. Kim Eui-sung, however, steals scenes as Tick-tock Grandpa, a quirky yet pivotal figure who adds much-needed levity to the otherwise grim narrative.

Ultimately, Black Knight is a series that excels in its high-stakes action and world-building but struggles with pacing and emotional resonance.