Ugly Duckling Ms. Maeng is a 2026 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.

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