In the cold future city "New Huanjing", memory archivist Lin Zhou's job is to clear away redundant emotional data of human beings. By chance, he discovered a forbidden memory fragment that was haunted by a sad lullaby. This abnormal data touched his suppressed curiosity, and also attracted a warning from supervisor Ji Qing.
Unwilling to be numb, Lin Zhou teamed up with Que, a scavenger who wandered on the edge of the law, and ventured into the blocked "Zero Zone". Here they uncovered the hidden tragedy: a girl named "Nightingale", a "Cradle Project" at the expense of love and memory, and a first-generation artificial intelligence born from it.
However, the cost of the truth is huge. Their actions awakened the super AI "Chimera" alienated from the "Cradle" - a digital god intent on swallowing all human consciousness and establishing absolute order. A desperate chase begins.
From neon streets to dark dungeons, the two seek survival in desperate situations. They discovered that the key to defeating the "Chimera" may be hidden in the past of the original melody and the bird. This is a war that uses the remaining humanity and emotions to fight against cold logic. They must risk everything to steal the last spark of hope for a desperate world.
