Mr. Kim is jobless, lost in debt and has been dumped by his girlfriend. He decides to end it all by jumping into the Han River – only to find himself washed up on a small, mid-river island. He soon abandons thoughts of suicide or rescue and begins a new life as a castaway. His antics catch the attention of a young woman whose apartment overlooks the river. Her discovery changes both their lives.

Sohyun, a runaway, is left alone after her close friend Jungho disappears. By accident, she gets to know a transgender woman named Jane. She joins Jane and her close-knit community of runaways, who are as comforting and loving as a real family. Sohyun feels happy and at peace. But her happiness does not last long. There is something wrong with Jane’s health.