In a future city called "Mirror City" made of seamless glass and holographic images, a man code-named "Zero" lost all his memory after an "accident." With the help of his exclusive guardian Eve, he rebuilds his life by implanting "memory fragments". However, the abnormal reflection flashing in the mirror, the mysterious code appearing out of thin air, and the warning from a stranger calling himself "K" made him begin to doubt: Is these warm pasts that were instilled real salvation, or is it a cage of carefully woven lies? In order to find the truth, he must find his true self in the maze of memories that are difficult to distinguish between true and false.
