Ling Zhou woke up on an isolated island shrouded in gray fog and lost all his memories. The mysterious girl tide on the island told him that this is the end of memory and the beginning of forgetfulness. Everything on the island, from the gravel to the lighthouse, is made of fragments of memories that have drifted here. If you want to leave, the only way is to dive into the "Sea of Oblivion" and retrieve your core memories. However, every search is accompanied by huge risks. What you find may be warmth, or it may be unbearable pain. When pursuing the ultimate question of "Who am I?", Ling Zhou must make a choice: embrace a peace without a past, or risk being torn apart by the truth and take back his own life?