Yeon Sang-ho is best known as the director of the hit film Train to Busan (2016), in which fast-moving, quick-thinking zombies terrorize passengers aboard a confined train. Following its global success, Yeon continued to expand his creative universe through works such as Parasytes: The Grey (2024), The Ugly (2025), and, most recently, Colony (2026). While his style continues to evolve, his body of work reveals a set of consistent thematic concerns—most notably, a critical engagement with established systems of power, whose insatiable drive for expansion often manifests in monstrous forms.
In Train to Busan, the zombie outbreak originates from a chemical leak that triggers a mass contagion. This “accident,” which transforms ordinary people into violent beings, can be read symbolically as an extension of a corporate culture deeply entrenched in the logics of profit and efficiency. The zombies, then, are not merely external threats; they represent the exposed and uncontrollable consequences of a system that ultimately collapses under its own contradictions. As chaos erupts both inside and outside the train, what unfolds is less an invasion than an implosion—the system turning against itself.
Another way to interpret this narrative is through the cyclical reversal of power relations. The dominated, once marginalized and invisible, return in a radically altered form to dismantle the structures that once governed them. Even in extreme disorder, this inversion carries a certain logic: what has been suppressed resurfaces with destructive force. In Train to Busan, the transformation of ordinary citizens into zombies leads not only to the breakdown of social order but to the symbolic annihilation of the system itself, extending beyond the train to the nation at large.
Against this backdrop, Yeon’s participation as a co-writer in Human Vapor (2026), a Japanese-produced series directed by a Japanese filmmaker, raises an important question: do his characteristic thematic concerns persist across national and industrial boundaries? If so, how might they be reconfigured within a different cultural and production context?
Human Vapor (2026) is based on the original film The Human Vapor (1960), directed by Ishirō Honda, known for his kaiju (monster) films. The original tells the story of a man obsessed with a dancer, who gains the ability to transform into white vapor. His power recalls figures such as DC Comics’ Sandman, yet he uses this ability to rob banks in order to finance the dancer’s career. Acting as a mysterious benefactor, he supports her attempted return to the stage following a period of ill health. The narrative also carries echoes of The Phantom of the Opera, in which a hidden, ghostly figure forms a secretive bond with a young performer.
In the new series Human Vapor, the central relationship shifts to a young man, Ren, and an abandoned girl. Beyond this reconfiguration of characters, however, the series represents a near-complete overhaul of the original film.
What Has Changed
A meteor strike becomes the defining event that reshapes the narrative. The science fiction elements—malignant extraterrestrial matter, government cover-ups, and the victims produced in the process—are woven into a storyline that closely aligns with Yeon Sang-ho’s recurring interests. This background quickly transitions to the present, where a journalist, Kyoko, interviews a scientist on a live television program. During the broadcast, a white vapor appears in the studio, moving across the floor before entering the scientist through his nose and mouth. His body swells, levitates, and ultimately explodes mid-air, splattering blood across the set and onto Kyoko’s face. The series moves between past and present to connect the meteor event with this violent incident.
In developing this narrative, Yeon, as writer, does not dwell on complex institutional processes or extended philosophical reflections on the human condition in a technologically blurred reality. Instead, he establishes the core conflict with efficiency: a toxic meteor, a concealed origin, and a government agency determined to suppress the truth. The cleanup process relies on the forced mobilization of society’s most vulnerable—vagrants and the homeless—thereby turning marginalized individuals into both victims and instruments of the system. As the meteor’s toxicity spreads, those exposed to it suffer fatal consequences. Ren, however, survives, transformed into a being capable of shifting into a lethal vapor.
Ren exemplifies the logic of systemic implosion that characterizes Yeon’s narrative world. Initially part of the government’s clandestine effort to contain and erase the truth, he becomes, through his transformation, a force that turns against the system itself. His condition is not simply monstrous but internal to the structure that produced him. As such, his vapor form operates as a metaphor for a system that is fundamentally flawed from the outset. In Yeon’s fictional universe, power rarely appears as benevolent or stable; rather, it tends toward corruption and ultimately generates the conditions for its own undoing.
Across Borders: A Traveling Logic of Systemic Failure
What Human Vapor ultimately foregrounds is not a nationally specific crisis, but a more transferable logic of systemic failure. As in Yeon Sang-ho’s earlier works, the narrative is structured around the collapse of institutional responsibility, where scientific knowledge and technological advancement are mobilized not for public good but for the protection of power. The meteor incident, the state’s attempt to contain it, and the sacrifice of marginalized populations all point to a system in which human life is subordinated to control and capital.
This dynamic is not confined to a single national context. Rather, it reflects a broader condition of contemporary capitalism, where the alliance between science, state, and industry often produces exclusion instead of protection. In this sense, Human Vapor extends Yeon’s established concerns into a different setting without fundamentally altering their structure. The marginalized remain the first to be exposed, the system continues to conceal its failures, and the resulting crisis unfolds through bodies that bear the cost of this imbalance.
What becomes striking, then, is how seamlessly this framework operates within a Japanese narrative. The critique does not lose its force in translation; if anything, its applicability across contexts reinforces its claim to universality. The failures depicted are not uniquely Korean or Japanese, but symptomatic of a shared condition in which systems designed to manage risk instead redistribute it downward.
Only at this point does a more subtle historical resonance begin to emerge. Without being explicitly foregrounded, the transposition of Yeon’s perspective into a Japanese context carries a quiet irony. A mode of critique shaped within a society once subjected to imperial domination is now used to reimagine the structures of power in a former imperial center. This is not a reversal in any direct or literal sense, but a reframing—one that allows the “colonized” perspective, however indirectly, to cast a critical light on the “colonizer.”
The effect is understated but significant. It is not history retold, but history faintly echoed through the movement of ideas. In this sense, Human Vapor becomes more than a continuation of Yeon’s thematic concerns; it becomes an instance of how those concerns travel, settle, and acquire new meanings across different historical and cultural terrains.
One of Yeon Sang-ho’s key works, Train to Busan, begins as a striking amalgamation of Western zombie conventions and Korean contexts, ultimately leaving the audience with the sense of encountering something newly realized. Its critique of Korea’s rapid transition into high modernity is both radical and visceral. Transplanted into another setting, Yeon’s critical perspective continues to function as a framework capable of capturing experiences that resonate across contexts, particularly within systems that prioritize efficiency over human values. This transnational shift does not dilute his critique; rather, it reinforces the broader applicability of his concerns. At the same time, it introduces a subtle irony: that this transposition unfolds between countries once positioned as colonized and colonizer, allowing one perspective to quietly reframe the other.