In the aftermath of World War II, Goh Junja is the latest successful deep-sea diver in a family of strong haenyeo. She makes the family's annual trip to Mt. Halla and while there, she falls in love with a mountain boy Yang Suwol. But when Junja returns, it is just in time to see her mother take her last breath. When Suwol is arrested, and the perils of post-WWII overtake her homelands, Junja must learn to navigate a tumultuous world unlike anything she's ever known.