Min Jae lives with his mother in Seoul. He now has an issue: his mother's affair with somebody else.
Min Jae takes expensive math tutorials and visits Daegu to find out the truth about her mother's travels.
Seo Yeon goes out for dinner with her mother and her mother's boyfriend. Min Jae quits his tutoring.
Min Jae and Seo Yeon share and talk about the pain they suffer. The two comfort each other in strife.