Lee Sun Bin Joins CSAT Team in Comedy ‘Ugly Duckling Ms. Maeng’

Korea’s most consequential academic examination becomes the unlikely setting for comedy in the upcoming film “Ugly Duckling Ms. Maeng.” The movie follows a small-town Korean language teacher who finds herself working inside the secretive headquarters where questions for the College Scholastic Ability Test, known nationally as the Suneung, are developed. The film premieres in theaters nationwide this October.

The Plot: An Administrative Mix-Up with National Stakes

Lee Sun Bin stars as Maeng Bo Ram, a Korean language teacher working in a provincial town outside the capital. Through an administrative error during the recruitment process, she becomes unexpectedly involved with Korea’s most secretive testing operation. The headquarters seal themselves off for 40 days as the committee works to produce “problem-free questions”—content with no typos, ambiguities, or language that could spark dispute or legal challenges. The examination being prepared will shape academic futures for approximately 500,000 students.

The joke at the heart of the story cuts deep: the committee actually intended to recruit a different Maeng Bo Ram, a seasoned expert in question-setting with years of institutional experience. Instead, the inexperienced version arrived. Once inside the sealed facility, Maeng discovers she has landed among veteran question setters whose heated meetings fill with passionate debate and raised voices over every word choice, every grammatical construction, and every potential interpretation a student might extract from a passage.

Meet the Question-Setting Committee

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The Leadership

Yoo Jae Myung portrays Moon Joo Yeol, who heads the Korean language question-setting committee—the figure responsible for steering the team through their 40-day isolation and ensuring no detail escapes their scrutiny. Kim Young Min appears as Park Kyung Tae, leader of the CSAT review committee, bringing oversight and his own standards to the process. These two figures emerge as central to the film’s conflicts, engaging in heated confrontations across desks as disagreements over questions and approaches intensify.

The Mediator

Jeon Seok Ho takes the role of Ki Jun Su, an employee of the Korea Institute for Curriculum and Evaluation who finds himself caught between competing agendas and personalities. He appears frequently in the trailer desperately attempting to stop the confrontations that break out, positioning himself physically between clashing committee members to restore order.

The Visual Chaos at Headquarters

The film’s main poster captures the environment within the question-setting headquarters at a moment of complete disorder. CSAT passages fly through the air of a meeting room. At the center, Maeng Bo Ram stands shocked and uncertain, visibly overwhelmed by the scene. This image encapsulates the pressure and intensity of the 40-day project where every decision carries enormous weight. The poster shows not a calm, orderly workspace but a collision of personalities and pressures brought together under impossible conditions.

The Trailer: From National Calm to Hidden Chaos

Setting the National Context

The trailer opens on the actual day of the CSAT examination, when Korea’s entire infrastructure shifts to accommodate the test-taking process. News anchors announce that aircraft takeoffs and landings have been suspended nationwide for the duration of the morning exam sessions. The opening of the nation’s stock market has been delayed as well. This is the moment when the examination that was being secretly crafted over the preceding 40 days goes public, and the entire nation watches as hundreds of thousands of students take an exam that will shape their academic futures.

The Flashback to Recruitment Chaos

From this image of national intensity and careful planning, the footage cuts back 40 days to show the behind-the-scenes reality at the question-setting headquarters before any of that smooth process became possible. Maeng Bo Ram’s first arrival shows her completely oblivious to what awaits her—she appears cheerful and bright-eyed as Ki Jun Su frantically leads her into the sealed building. The moment of revelation comes when Ki Jun Su’s desperate shout breaks through: “It’s an emergency in the Korean language department right now!” This outburst crystallizes the confusion that set the entire comedy in motion. The wrong Maeng Bo Ram arrived at the facility.

The Struggle and Determination

Once sealed inside the headquarters, Maeng does not allow herself to be intimidated despite the intensity surrounding her. She refuses to retreat as she struggles to keep pace with the veteran question setters whose meetings fill with raised voices and serious disagreements over every word choice and grammatical construction. The trailer cuts rapidly between moments of tense debate and Maeng’s determined efforts to complete her unexpected assignment. The montage suggests a journey where an outsider gradually finds her footing in an institution built on decades of expertise and institutional weight.

The Moment of Recognition

The trailer closes with a shift in tone. Park Kyung Tae, the review committee head, offers Maeng Bo Ram a thumbs-up and delivers the line, “You did very well.” Maeng’s reaction—ducking down behind a desk while cheering with delight—provides the film’s comedic beat. After navigating 40 days of chaos, pressure, and institutional intensity, she receives validation. The accidental committee member has earned her place.

Coming to Theaters This October

“Ugly Duckling Ms. Maeng” arrives in theaters nationwide this October as a comedy that mines humor from bureaucratic accidents, institutional pressure, and ordinary people thrust into extraordinary circumstances. The film taps into the unique cultural weight that Korea’s college entrance examination carries—a test so significant that the nation itself pauses for its administration—while treating the behind-the-scenes operation as farce. For Korean audiences, the premise speaks directly to a lived reality: the CSAT shapes destinies, and someone actually has to write it.