A young, beautiful 26 year old woman who teaches mathematics and also acts as the homeroom teacher for class 3-2. She lives with her sister and niece in an apartment block quite close to Jin-Ho's. Her father’s unexpected departure from her life when she was young has had a huge impact on her. Even though she is extremely attractive and was apparently popular throughout her school life, she has become very guarded around men, feeling unable to trust or form relationships with them. Consequently she is still a virgin and even has her first kiss during the course of the story. She also seems to be following her mother's career path, who was also a teacher and became the district superintendent before retirement. She also has a crush or love for Myung, Jin-Ho a student in her class and is defenseless around him.