A 19-year-old high school student becomes pregnant and has the baby. She raises her baby alone and finds her own love.

19-year-old Mi-Sol (Lee So-Yeon) lives with her mother and uncle. She is senior in high school and lives her life pretty much like other high school students. Mi-Sol studies hard to enter a good university and her mom is enthusiastic over her studies. Not knowing why, Mi-Sol finds it difficult to wake up early in the morning and starts to eat a lot.

Suk-Bin (On Joo-Wan) and Mi-Sol have become friends through their mothers who know each other. Suk-Bin is an honor student, but stresses over his mother's lofty expectations for him. His family lives in the guest house on his uncle's estate and his father works for his uncle's company. His uncle's mother-in-law runs a big company. His uncle and aunt get along well, but they do not have children. His aunt has a secret. She gave birth when she was 20 years old, but her mother dumped the baby and told her that the baby was dead. The aunt overhears her mother talking on the phone and learns that her baby did not actually die. On the way home from the orphanage where she tried to find information on her baby the aunt dies in a car accident.

Meanwhile, So-Ryong (Lee Jae-Yoon) is a university student. His lives with his parents (his mom works as a high school teacher) and his troublemaker grandmother. Because of the grandmother the family is in financial difficulties. Nevertheless, So-Ryong is a positive and good person.

Mi-Sol has no idea what might be the cause of her unusual symptoms. One day she learns that one of her friends got pregnant and others gossip about. Mi-Sol realizes that she might be pregnant as well. Mi-Sol becomes paranoid and decides to take a pregnancy test. The test comes out positive. One day, Mi-Sol dresses up like an adult and goes to a clinic to have an abortion, but she feels her baby inside of her ...