In the cyber city where neon lights and rain intersect, she is a phantom awakening from a nightmare.
Su Ying, a woman who has lost all her memories, builds a fragile peace in the shadow of Star Port City. Until one rainy night, the death of a strange man handed a blood-stained metal box to her hands, and also brought a name that made her tremble - "The Nameless Key".
The scar on her chest is the only coordinate pointing to a forbidden experiment called "The Cradle." As the only successful product of the "Echo Project", there is a code buried deep in her consciousness that can subvert the world. When the chase ensues, she discovers that the fighting instinct she awakened while on the run and the strange memories that suddenly emerged point to a cruel truth - she is not only the key to unlocking the "Purge Day" global agreement, but also the original "carrier" of this conspiracy.
On the way to pursue her own identity, she was forced to form an alliance with the remaining resistance organizations, coexist with multiple memories in her body, and fight to the death on the border between reality and consciousness. But when she finally gets to the core of the truth, she faces the most difficult choice: destroy this "key" and end everything; or accept it and become the opener of a new era.
