Yoo-jung decides to take a guitar class before her trip to Europe with her boyfriend. Coincidentally, the guitar teacher has the same name as Hannah, the main character of the love song she wants to learn. Yoo-jung spends a month of summer singing a love song for Hannah in front of Hannah.

High school student Yun-ji harbors a secret romance with her homeroom teacher, which results in a pregnancy. When the teacher abruptly disappears, Yun-ji decides to end the pregnancy. To buy illegal abortion pils, she leaves school early. Meanwhile, Kyung-sun discovers that her savings have vanished and sets out to track her down.