In a future where memories can be accurately stripped and stored, Lin Mo is a top "memory cleaner." Day after day, he erased the pain for his clients and maintained a blank mind for himself. During a routine operation, he accidentally came into contact with a memory fragment that did not belong to the client, but resonated strangely deep in his heart - a lonely lighthouse and the blurred silhouette of a girl. This "ghost memory" breaks his numb routine and forces him to question his past. In order to explore the truth, he found the owner of his memory, Su Wan, a girl who had been deprived of important memories. The two formed a fragile alliance and dived into the abyss of memory and forgetfulness together, trying to uncover the shocking secret behind the dome technology that could subvert the entire social order.