In the "Sea of Oblivion" outside time, stands a lighthouse that collects memories. Lampkeeper Lin Yu, a man who has lost his past, guards countless memory crystals that carry joy, anger, sorrow and joy day after day. His world was as still as water, until one stormy night, the mysterious woman Shen tide broke in, completely breaking the loneliness. She is not seeking refuge, but is looking for a banned crystal that shines with an ominous red light. When the two accidentally touched that broken memory during the fight, a shared past buried by fire and betrayal began to scream piercingly. Lin Yu was forced to question his identity. Is Shen tide's arrival for redemption or revenge?