Shen Zhixia is exiled to a deserted island, where food and salt are scarce from the very beginning, leaving everyone on the brink of despair. Using her modern knowledge of salt production, she dries seawater to make sea salt, saves the displaced people, and stabilizes the camp. She then leads everyone in reclaiming wasteland, building salt fields, repairing ships, and defending against enemies. From being completely alone and helpless, she becomes the backbone of the entire island. With the coastal frontiers plagued by danger in these turbulent times, she joins forces with the Marquis Who Guards the Sea to overcome one crisis after another. Together, they protect their home against all odds and rewrite each other's destinies.