In Kongsang City, ancient secrets are hidden under the prosperity of science and technology. Interpol consultant Xie Linyuan is actually the "Yuan Guardian" guarding the thousand-year seal. He is rational but lonely. The genius of the biology department promised that the aura of the phoenix without knowing it was sleeping in his body. A bizarre case binds them: he uses magic to track down the shadow, and she uses science to analyze anomalies. When the threat of annihilation of the ancient times awakens again, she is the "key" that he must protect and the "variable" that can burn everything. In the urban labyrinth where neon lights and talismans intersect, the two work side by side to break through the ordinary appearance and face the vast reality.
