At the end of the world, there is a lighthouse that does not guide ships. It guards forgotten memories. The lampkeeper silently sorted out the fragments of time sealed in the crystal day after day, until a woman named Lin Yuan broke in. She did not hesitate to do anything to retrieve a dangerous memory sealed by her own hands. Her arrival not only broke the tranquility of the isolated island, but also touched upon the dusty past of Silence itself. When the tide of memory surges, he must make a choice between rules and truth that can change everything.