The story begins in 2077, when the earth's temperature plummeted to minus 80 degrees, and humans were forced to flee underground. AI robots (including the four mythical AIs - Xuanwu, Phoenix, Tianlong, and White Tiger) have taken on the task of assisting human beings in survival and helping them collect surface resources.
As a technological expert in the underground shelter, Ling Yichen manages the AI system and maintains the order of human existence. The heroine Li Nianyan is a biologist who focuses on restoring the earth's ecology.
The dark side of the underworld:
The harsh environment of underground life leads to constant internal conflicts among human beings. Dark sides such as resource constraints, fraud and power struggles gradually emerge. Li Nianyan tried to find hope for the future of ecology and mankind, but everything was full of difficulties and challenges.
Chu Yuan - the hero's loyal partner:
Ling Yichen owns a first-generation AI robot, Chu Yuan. Unlike other AIs, Chu Yuan has a unique emotional module and learning ability, and is Ling Yichen's most trusted partner. Chu Yuan gradually showed more empathy and independence in his interactions with humans.
