In an era where Alzheimer's disease is spreading, people's most precious memories will disappear like sand paintings. Lin Mo, a memory keeper, runs a small shop called Echoes of Yesterday in the deep alleys of the city. He can strip memories from his mind and seal them in special crystals. He guards the past of others, and also imprisons his longing for his deceased wife. One day, a mysterious woman named Su Qing broke in. She didn't want to save it, but just wanted to completely forget a memory. This seemingly simple commission actually involved Lin Mo in a huge conspiracy. He was forced to step out of the island of memories, face the sea of forgetfulness that could swallow everything, and re-explore the weight of memory and the meaning of life.
