In the future "Silent City", every citizen will be forcibly implanted with a "memory purification chip" after reaching the age of 18, and all negative emotions and traumatic memories will be cleared regularly. There are no tears, no anger, no fear in this city - and no love. Yan Ji is an outlier who "failed to purify". Not only did he retain his complete memory, he also discovered that he could hear the echoes of other people's sealed emotions. When he was sent to the "Deep Purification Center" on the seventh floor underground, he accidentally discovered a shocking secret: the so-called "purification" of this city was actually extracting human emotional energy to feed an unknown existence called the "abyss." In order to prevent the coming harvest day, Yan Ji must unite a group of similarly "imperfect" prisoners and find an exit to the real world above the ground before their memories are completely erased.
