Ugly Duckling Ms. Maeng () is an upcoming South Korean comedy film written and directed by Lee Yong-jae in his directorial debut. It stars Lee Sun-bin as the title character, along with Yoo Jae-myung, Kim Young-min, and Jeon Seok-ho. The film follows Maeng Bo-ram, a Korean language teacher who is unexpectedly selected for the CSAT question committee, a Level 2 state secret. The story depicts her 40-day experience of isolation during the committee's secluded retreat. Distributed by By4M Studio and Barunson E&A, it is scheduled to be released theatrically in South Korea in October 2026.
It will have its world premiere at the 31st Busan International Film Festival in October 2026 as part of the Korean Cinema Today - Panorama section.
Cast Lee Sun-bin as Maeng Bo-ram, a former frontline Korean language instructor who was appointed to the committee following an administrative error. Yoo Jae-myung as Moon Joo-yeol, chairman of the Korean Language Question Committee and a Seoul National University Department of Korean Language Education graduate. Kim Young-min as Park Kyung-tae, the Review Committee Chairman, whose qualifications are comparable to Joo-yeol's, with the exception of physical appearance. Jeon Seok-ho as Ki Jun-soo, an employee of the Korea Institute of Curriculum and Evaluation and Joo-yeol's right-hand man.
Production Development Ugly Duckling Ms. Maeng is the directorial debut of Lee Yong-jae, writer of In Our Prime (2022) and Secret Zoo (2020), and is produced by Joy Rabbit, the production company behind In Our Prime. Director Lee Yong-jae said the film focuses on the CSAT question-setting process and a story spanning 40 days.
Casting According to the film industry in February 2023, Lee Sun-bin and Yoo Jae-myung were cast to star. Lee Sun-bin, Yoo Jae-myung, Kim Young-min, and Jeon Seok-ho have been confirmed as the main cast.
Filming Principal photography commenced on April 24, 2023. Filming concluded on June 21, 2023, following 35 shooting sessions over a period of three months.
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