Goyangiwa Sae

Jin Young is a high-achieving student, though she struggles with mental instability. Hye Jung works at her mother's small restaurant, serving simple meals to customers, and maintains a cheerful demeanor. They are classmates and later transfer to a private school that offers independent study. There, they meet Si Hyung, a teacher at the school. Si Hyung and Jin Young were childhood neighbors, and he is taken aback by her transformation into a distant and unfeeling individual.