In the future city "Mirror City" where memories can be erased, edited and traded, No. 734 Is a "Purifier" who has lost all personal memories. His life is like a blank sheet of paper, fed standardized happy memories by the system every day. However, a recurring "illegal" memory fragment that does not belong to him - a blue ocean and a vague smiling face - breaks this false calm. In order to find the answer to "Who am I?", He stepped into the gray area of the memory black market and dealt with the mysterious memory merchant Eva and the cold memory monitor K. In this maze of data and lies, every step may lead to the truth, or it may lead to a deeper abyss.
