The populace of a South Korean island rebels against police brutality. The protesters are labeled as communists, and the army is dispatched.

Yeong-joo, a former synchronized swimming athlete goes to Jeju Island to put together a synchronized swimming team for a performance. She slowly befriends the haenyeo, or female divers, and gradually begins to fit into their way of life.

Over ten years ago, their mother passed away after giving birth to the youngest sibling. Not long after, their ailing father also died. Now, with an eviction notice in hand, the four siblings are left with only a letter from their father and a car registration under Chun-ja's name. Chun-ja takes back the car that their uncle had been using. After a family meeting, they agree with Jun-myung, the third sibling, who wishes to take a year off from school to travel. They set off on a camping journey together.