On an isolated island where countless people's memory crystals are stored, Lin Yu, a lightkeeper with no past, guards the lighthouse day after day, maintaining the dim light of the crystals. Until one day, a mysterious woman named Shen tide came by boat, looking for a dust-laden memory about her brother. Her arrival not only broke the tranquility of the isolated island, but also knocked on the door of Lin Yu's blank memory. As the two delve into the secrets of the lighthouse, they discover that the truth about the island, each other's fate, and the forgotten past are far more cruel and closely connected than they imagined.
