In a future city where memories can be repaired and emotions can be edited, Gu Chuan is the top memory restorer of the "Eternal Heart" company. He takes it as his own duty to heal the wounds of others and carefully repairs each broken soul. However, a strange "crack" appeared during a routine repair, allowing him to glimpse the fears and lies hidden under the perfect memory. When he started investigating, he discovered that his most cherished memory of his deceased wife was actually an unreachable island, encrypted in layers. In order to explore the truth, Gu Chuan embarks on a dangerous path against the entire world. He will discover that forgetfulness is not a gift, but memory may be the highest price.