On the isolated island of Isselburg, residents undergo a "purification" every once in a while, erasing all personal memories in order to maintain absolute harmony. The lighthouse keeper Lin Zhou, after a "purification", was left with a broken echo that did not belong to him - a woman's laughter. This tiny anomaly, like a pebble thrown into stagnant water, aroused his dangerous desire to explore the truth. He began to secretly fight against this perfect forgetting mechanism and approached Ila, the archivist who holds all the records. Between the island of memory and the vast ocean of forgetfulness, Lin Zhou's pursuit is not only to find "himself", but also to uncover the cruel and tender secret that this island has concealed with countless forgetfulness.
