Ling Su, a top memory evaluator with amnesia, accepted a mysterious commission to explore the cause of death of a deceased wealthy businessman. After sneaking into the tampered memories of the deceased, he discovered a "Purification Protocol" conspiracy led by the technology giant "Yongzhi Technology" to "format" the negative memories of mankind in the city. This discovery caused him to be frantically hunted by Shen Zhuo, the security director of Yongzhou Technology and his past enemy.
While on the run, Ling Su was forced to join forces with Nightingale, a key member of the resistance organization "The Echoes." The two went from distrusting each other to being dependent on each other for life and death. In crisis after crisis, Ling Su not only uncovered the truth about the "Purification Agreement", but was also horrified to discover that his past amnesia was closely related to this inhumane plan - he was the chief designer of the plan.
Faced with the painful truth and Nightingale's complicated eyes, Ling Su finally chose to take responsibility. With the help of the "Echoers", they launched a general attack on the headquarters of Yongzhou Technology. In the final battle, Nightingale sacrificed for him, while Ling Su went deep into the core of the system, destroyed the "Purification Protocol", and returned true memories to everyone in Lumen City. The city falls into chaos, but the truth is revealed. With the restored memory and the digital message left by Nightingale, Ling Su looked at the city that might be reborn from the ashes, and an even bigger shadow was emerging from behind the scenes.
