Su-min and Jin-ho are siblings living together. Their parents declare to them that they will divorce soon. They say that it is not decided yet how the four members of the family live apart, and ask them to wait for about 2 weeks. Su-min spends every day worrying about which parents she's going to live with and whether she will live apart from Jin-ho. One day, her parents offer her a suggestion.
During a summer vacation, Ok-ju and Dong-ju move into their grandpa's house. While Dong-ju adapts to his new home, Ok-ju feels awkward about this new environment. Once their soon-to-be-divorced aunt also moves in, and as Ok-ju spends time with her family, the house and her grandpa start to grow on her.