The painter Hongxiu is famous for her lifelike koi fish, but no one knows that she is also a ruthless assassin in the night. In childhood, "Aluan" encountered an accident and transformed into a killer. But every time she completes an assassination mission, the bloody "blood-eating koi" jade pendant keeps drawing her into a deeper conspiracy.
As she investigates, Hongxiu discovers that she is being manipulated by an organization called the "Nine-faced Ghost". Its leader "Lord" attempts to use the ancient evil "soul-eating breath" and "boundless formation" to devour everything in the world and realize "eternal nothingness". The "carp blood" in Hongxiu's body is actually the key to activating the formation and fighting against nothingness.
With the help of Imperial City Secretary Li Yuan, the eldest princess and other allies, Hong Xiu completed Nirvana through "melting blood and casting souls" and awakened the power of "Returning to Origin". She is no longer a chess piece at the mercy of others, but a "returner" who shoulders the life and death of the world. A final battle involving existence and nothingness, with Changjing City as the chessboard, is about to begin.
