Kim Ji-young, an ordinary woman in her 30s, suddenly shows signs of being inhabited by other women from her life, past and present.

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.

Six months ago the son of the married couple drowned. The couple, together with the teenager that their son saved, begin a journey to cope with the loss.

It was one day after summer vacation, in 2008. Sojeong, a senior high school student, lives with her sick mother, but dreams to live alone and be a musician though the reality is frustrating. Just listening to music on MP3 and writing down the lyrics of the songs she wrote on her mini-homepage is Sojeong´s only escape.

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.

One winter, a note circulates spreading rumors, stirring up the Korean Military Academy. Jiwoo, who despite his confident attitude hasn’t secured a recommendation letter, and Hoon, a graduate dreaming of assisted suicide in Switzerland, encounter someone else at the Academy during the quiet night.