A special agent in the Japanese city of "Shangyong" - Li Na. She has the ability to sense residual memories in objects and spaces. During a mission, she extracted an extremely dangerous echo from a classic in the old world. Its source was a mad scientist named "Prometheus". This echo caused Ye Qing, the granddaughter of the city leader "Great Elder", to fall into a deep coma. After being secretly entrusted by the Great Elder, Li Na entered Ye Qing's spiritual world and faced the echo's true nature - Prometheus. There, she learned that Prometheus was the instigator of the "Great Silence" disaster that led to the destruction of the old world. After an arduous spiritual battle, Li Na used her painful memories and humanity as an ordinary person to "pollute" Prometheus' inhuman consciousness, and finally defeated it.
