In the future city "Xinhai" where memories can be accurately trimmed and stored, top memory trimmer Lu Zhou is known for his calmness and precision. He regards memories as data, erasing pain for clients and building a perfect life. However, during a routine operation, a nursery rhyme melody that did not belong to the customer and could not be deleted invaded his consciousness like a ghost. This string of broken notes leads to his dusty past and a shocking secret called "Lighthouse Project". When the island of truth looms in the ocean of oblivion, Lu Zhou must decide: continue to be the executioner maintaining false peace, or dive into the deep sea to salvage the truth that may swallow him completely.
