In the future city, "memory retrieval" technology can peel away painful memories and store them in a huge database called the "Sea of Forgotten". Ling Chen is a top "memory ferryman", dealing with these abandoned emotional fragments day after day. He is calm and professional, like an island isolated from the world. Until one day, in an anonymous memory, he saw a vision that only belonged to him - a lonely lighthouse and a woman's vague smile. This memory that shouldn't exist is like a key, opening up his dusty past. The appearance of a mysterious visitor Su Yin draws him into a huge whirlpool about identity, truth and redemption. He must dive into the ocean of countless hearts and find the forgotten self.
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