On the border eroded by fog and tide, in the uninhabited world where wasteland and sea intersect, Mulan walks alone on broken islands and dry salt flats. She did not come for gold, nor for glory, but to pursue an ancient legend - a sea bone that contains memories of past lives. It is said that it can find the roots of lonely souls and can also revive the world. On the wasteland, the wind roared like a whip, and Mu Lan, accompanied by the shadow, approached the forgotten underwater cemetery step by step. But when she uncovered the truth, she discovered that the treasure was not just a thing, but the last glimmer of herself that could hold on to herself in loneliness. Loneliness and desire, memory and redemption, intertwined into songs in the salty wind. Mu Lan's journey is a confrontation with the sea, the wilderness, and the soul, and it is also the ultimate test of belonging.