High school teacher Gyeongseok agrees to look after his daughter Yunhui for his ex-wife’s sudden request. He brings Yunhui with him to the school where he works. There, he leaves Yunhui alone in the car briefly, and when he returns she’s gone. Later, Yunhui is found after having been grievously injured in a car accident. The driver of the truck that hit her, however, indicates that Seik, one of Gyeongseok’s students, was the true cause of the accident.

Sumin and Jinho 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. Sumin spends every day worrying about which parents she's going to live with and whether she will live apart from Jinho. One day, her parents offer her a suggestion.