Dayeon wants to be a haenyeo just like Grandma. The haenyeo dive off the coast of Jeju Island to pluck treasures from the sea - generations of Korean women have done so for centuries. To Dayeon, the haenyeo are as strong and graceful as mermaids. To give her strength, Dayeon eats Grandma's abalone porridge. She practices holding her breath while they do the dishes. And when Grandma suits up for her next dive, Dayeon grabs her suit, flippers, and goggles. A scary memory of the sea keeps Dayeon clinging to the shore, but with Grandma's guidance, Dayeon comes to appreciate the ocean's many gifts.