Director Lee Yong-jae said he chose the College Scholastic Ability Test (CSAT) as the subject of his debut movie “Ugly Duckling Ms. Maeng” because the crucial exam means so much in Korea, even rerouting flights and bringing daily life to a halt across the nation. “The CSAT is a matter of interest for all citizens," Lee said at a theater in Seoul, Monday after the premier of “Ugly Duckling Ms. Maeng.” “I thought taking on this story would easily draw interest from audiences. No matter which part of our society you look at, you can see many different sides of it. As a new director, telling a story in one restricted space also helped save time and money." "Ugly Duckling Ms. Maeng" is a comedy about Maeng Bo-ram (Lee Sun-bin), a Korean language teacher at a high school in a small provincial town. Maeng accidentally becomes test developer for the CSAT due to an administrative error. Inside the locked camp, where the team members developing the test are isolated from the outside world for 40 days, she gets caught up in chaotic clashes with ambitious professors while trying her best