
Kim, an activist and law school graduate, is pursued by the mid‑1970s Park regime as he seeks to write a book about Jeon Tae‑il, the 22‑year‑old union activist who immolated himself to protest government hypocrisy. Their struggle ignites a broader movement that reshapes the nation.
Does A Single Spark have end credit scenes?
No!
A Single Spark does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of A Single Spark, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Jeong In-gi
Young-soo's Junior

Lee Yong-nyeo
Woman Buying Umbrella

Kwon Tae-won
Factory Owner

Park Cheol-min
Hanmisa Tailor

Moon Sung-keun
Young-soo

Dong Bang-woo
Tae-il's Father

Lee Sun-kyun
Newspaper Reader

Park Kwang-su

Yoo Soon-chul
Young-soo's Father

Park Yong-su
President of Pyunghwa Market

Hong Kyung-in
Jeon Tae-il

Lee Joo-sil
Tae-il's Mother

Kim Bo-kyung
Kyung-ja

Kim Sun-jae
Jung-soon
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Challenge your knowledge of A Single Spark with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
Which actor portrays the present‑day law graduate Young‑soo?
Read the complete plot summary of A Single Spark, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
In Seoul, a powerful, two‑timed story unfolds across color and black and white, weaving personal lives into a broader history of workers’ rights and political courage. At the center is a dual narrative that keeps returning to the question of what ordinary people will do when faced with exploitation and indifference from those in power.
In the contemporary timeline, Moon Sung-keun’s character Young‑soo is a law school graduate with a past shadowed by militant, subversive activities. He hides from authorities while quietly shaping a biography about Jeon Tae‑il, the garment worker whose death sparked a movement. Young‑soo moves with a careful resolve, meeting in secret with his wife Shin Jeong‑soon [Kim Sun-jae] who is pregnant and deeply involved in organizing a trade union at her workplace. Their home life is tender yet strained by the weight of risk and the urgency of their cause. To give his project substance, Young‑soo travels across the city, interviewing Tae‑il’s friends and former colleagues for the material that will illuminate the worker’s life and the harsh realities of life in the garment industry. He even reaches out to Tae‑il’s mother [Lee Joo-sil], bridging generations of struggle through dialogue and memory. This present‑day segment, rendered in vibrant color, often lingers on the bustling market streets and the crowded rooms where activists once debated, argued, and hoped for real change.
The film then shifts to a parallel past, presented in stark, monochrome frames that feel like a different era altogether. Jeon Tae‑il is a working man who begins by selling umbrellas in the streets, but soon earns a proper job at a garment factory in The Peace Market. The scenes reveal a harsh world where workers endure grueling hours, unpaid overtime, and meager pay, with few protections or benefits. Tae‑il’s father teaches him about the existence of labor laws, and this knowledge sparks a quiet, methodical campaign. Tae‑il conducts careful research, questions the bosses, and shares what he learns with his colleagues, distributing cakes to those who cannot afford to eat well. Inspired, the men and women form an activist group named The Fool’s Association, determined to push for recognition and enforcement of workers’ rights.
A key turning point comes when Tae‑il compiles a detailed report for the Ministry of Labour, demonstrating how many provisions are ignored in practice. The ministry promises to look into the issue, and Tae‑il exhorts his fellow workers to rest and recover, only to be fired for his efforts. He moves to a road construction project, where the abuse continues in different forms, yet his resolve does not falter. When he returns to the city to press the issue, he files a formal complaint, but the ministry once again proves more aligned with business interests than with the laboring people it is meant to protect. The narrative follows Tae‑il as he teams up with a journalist who needs solid facts, and Tae‑il travels from shopfloor to newsroom, gathering testimonies about pay, hours, sickness benefits, safety, and dignity. The journalist’s exposé, published in the newspaper, draws attention to the working conditions and spurs a new round of government promises and street protests.
As the protests resume and momentum builds, the workers realize that real change will require a bold, uncompromising act. They decide to burn a book of labor laws in a public demonstration, signaling their disillusionment with a system that talks of protections but rarely enforces them. In a climactic moment that embodies sacrifice and rage, Jeon Tae‑il douses himself with petrol, lights the book on fire, and runs through the streets shouting the stark, defiant line: > We are not machines.
Back in the present, the journey comes full circle. Young‑soo walks through the familiar spaces of The Peace Market and, in a quiet echo of Tae‑il’s legacy, encounters a young man who bears a striking resemblance to the famous activist. Clutching a copy of The Life and Death of Jeon Tae‑il by Kim Yeong‑su, the figure frames the film’s central question: how do the lives of workers and their champions endure beyond a single lifetime?
Throughout the film, the contrasts between the two timelines are not merely stylistic: they illuminate how memory, evidence, and everyday courage intersect to sustain movements over time. The color‑filled present underscores the weight of history carried by those who work and organize today, while the black‑and‑white past offers a stark reminder of the risks and sacrifices that brought about awareness and occasional reform. The story respects both the personal stakes—families, marriages, and friendships tested by political action—and the larger, often frustrating politics of reform, keeping a steady, contemplative tone that stays true to the real people whose lives inspired a nation to look more closely at workers’ rights.
Note: All actor links are provided to the official site format, and only those actors listed in the cast are linked.

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