During the Qingli period, the canal wept with blood.
A bronze dragon coffin emerged from the gate of Caohe River, which involved a huge network that entangled the government and the public - the "Cao League".
Su Huan, a demoted pragmatist cadre, joins forces with Wei Linglong, a runaway daughter who is proficient in studying things, Cheng Yuan, a Feng Shui successor with secrets, and Zhao Lan, an extremely intelligent human spirit princess, to form an alternative crime-solving team.
From the dragon coffin on the canal to the academy where fox shadows seek their lives, from the wax-encrusted dancers to the nightmare-like paper figures... They use the scientific and technological wisdom of "Mengxi Bi Tan" to penetrate the carefully designed puzzles of "ghosts and gods".
And when the clues finally pointed to the palace, they faced a shocking conspiracy that could overturn the New Deal and shake the country.
Can the four of them work together to break the thousand-year-old shady curtain that has shrouded the canal in the bright lights of Bianjing?
