After years marked by injury and failure, former swimmer Anna returns to her quiet seaside hometown, leaving her dreams behind. There, she crosses paths with Yun Deok Hyun, a quiet sea diver who remains trapped in his past, enduring time in silence. Brought together under one roof, Anna begins to learn diving from him, slowly finding her way back to life. But as their distance closes, unspoken emotions rise, and a long buried secret surrounding Deok Hyun begins to fracture their fragile peace. As the past refuses to stay buried, both are pushed to confront what they have been running from and find the courage to move forward.