Kwon Yeon-woo is a somewhat naive 30-year-old low-level civil servant who works in a city hall branch office. After moving into a new apartment, he encounters a high school girl, Soo-young, and sees her on his way to work every morning. She is a cheerful and eccentric 18-year-old who lives with her mother downstairs from him. Over time, the two begin to develop feelings for one another.
Meanwhile, 22-year-old Kang Sook, has just started working at the branch office. He falls head over heels for 29-year-old Kwon Ha-kyeong, a melancholy woman who wanders around taking pictures. She is still holding onto an old flame, and keeps looking for traces of that lost love every day. Kang Sook continues to woo her, regardless of her living in the past.
Can these two relationships ever lead to a happy ending?