On the isolated island of silence, memories can be precisely stripped and sealed. Ling Chen, the memory archivist, deals with the pain and joy of others day after day, but has no awareness of his own blank past. Until one day, a memory fragment that did not belong to any client, a lullaby, and a vague female figure accidentally broke into his system and dropped a huge boulder on his frozen heart. In order to pursue the truth, he began a secret investigation and met Anya, a woman who came to forget the trauma but was extremely sensitive. When the dusty files were opened one by one, he discovered that the cornerstone of this forgotten island was built from countless stolen life fragments, and he himself was both the caretaker and the deepest prisoner.