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Given that the movie is partly concerned about portraying sexually liberal Korean high schools in a candid way, such unrealistic development might be forgiven. But what sparks controversies among critics and moviegoers is that Oh doesn't know the difference between menstruation and bleeding from the first sex. It turns out that Oh gets so drunk before knocking on the door of Kang's apartment that she just falls asleep. In other words, nothing immoral happens, and coincidently Oh begins to menstruate for the first time, and thinks it is a sign of her lost virginity.