In a future city where memories can be accurately deleted and modified, Lin Mo is a top "memory stylist". Known for his calmness and precision, he erases a client's painful past like removing a dead nerve. He believed that forgetting is the best mercy. Until a mysterious old woman named Mrs. Hua came to her door and asked to delete a seemingly harmless memory about a lullaby. During the operation, this memory produced unprecedented resistance. A broken wooden bird totem flashed repeatedly, which not only shook Mrs. Hua's spiritual world, but also unexpectedly caused a fatal ripple in Lin Mo's own sealed sea of childhood memories. He was forced to realize that what he had erased might not only be other people's past, but also the only key to the truth about his life experience.