A Boy's Sister plot
Yoon-Hee bears the heavy burden after losing her younger brother in a traumatic childhood event. Her brother died after rescuing her from drowning in a rising river caused by heavy rainfall. Because of that incident, Yoon-Hee is unable to go out during the rainy season and is fired from her job as a result. One day, Yoon-Hee's wallet is stolen nearby by teenage Jin-Ho. In it there is only a picture of her younger brother. Then Yoon-Hee starts a new job as a high school cafeteria worker. During her work she meets Jin-Ho, the boy who stole the wallet. After talking to each other, both realize that they bear similar emotional scars from events from their past.