On the eve of the Double Ninth Festival, the Emperor returns with his son, Prince Jai (Li Gong), from a military campaign to Nanjing to celebrate the holiday with their family. Unbeknownst to them, scandal brews within the palace walls: the Empress has been engaged in an illicit affair with her firstborn, Crown Prince Wan (Yun-Fat Chow), born of the Emperor's previous wife. Complicating matters further, Crown Prince Wan also harbors feelings for Jiang Chan, the daughter of the Imperial Doctor, and he contemplates abdicating the throne to escape with her.
Concerned about their mother’s gravely poor health and her newfound fascination with chrysanthemums, Prince Jai learns from the Empress that she has been slowly poisoned by the Emperor and has devised a plan of rebellion against him. Initially hesitant, Prince Jai ultimately agrees to lead the uprising. To uncover the poison affecting the Empress, a mysterious woman is hired; however, she gets captured by Crown Prince Wan and brought before the Emperor. This woman is revealed to be Jiang Shi, the long-thought-dead first wife of the Emperor and mother to Crown Prince Wan. The Emperor, choosing to show mercy, pardons her and promotes the Imperial Doctor to the governorship of Suzhou.
In an emotional farewell with Jiang Chan, Crown Prince Wan is informed about the Empress’s creation of 10,000 scarves adorned with golden flower sigils. Upon confronting the Empress, he is devastated to learn of her treachery, prompting him to attempt suicide, though he survives the act.
On their journey to Suzhou, betrayal strikes the Imperial Doctor's household as the Emperor's assassins launch a deadly assault, resulting in the Doctor’s demise. In a desperate move, Jiang Shi and Jiang Chan return to challenge the Emperor, only to discover that Jiang Shi is actually Crown Prince Wan’s mother, meaning Jiang Chan is unwittingly his half-sister. Horrified by this revelation, Jiang Chan flees, pursued by Jiang Shi, only to be ambushed and killed by more assassins.
In a shocking turn of events, Prince Yu, the Emperor’s third son, murders Crown Prince Wan and reveals his understanding of the rampant corruption within the palace. He demands that the Emperor abdicates his throne, but the Emperor retaliates with hidden assassins that swiftly overpower Prince Yu’s soldiers. In a brutal struggle, Yu is punished severely, resulting in his death.
Outside the palace, the atmosphere shifts dramatically as Prince Jai leads 10,000 soldiers bearing golden flower sigils to storm the palace. They clash fiercely with the Emperor’s assassins and push forward into the inner sanctum, trampling the bed of flowers prepared for the festival. Yet, reserves of the Emperor's army arrive, decimating the golden soldiers; only Prince Jai manages to escape, only to be taken captive. As the grotesque scene unfolds, palace servants efficiently erase the evidence of rebellion, meticulously cleaning and reinstating order as if nothing ever happened.
With the festivities commencing at midnight, the Emperor expresses his discontent with Prince Jai, who had not sought the throne but rather fought for his mother’s honor. Faced with a choice, the Emperor offers to grant Jai pardon if he complies with the facade of the Empress’s poisoning. In a courageous act of defiance, Prince Jai declines and takes his own life, spilling his blood into a cup of poisoned tea intended for the Empress. In a moment of utter horror, the Empress recoils as the tea, now tainted, begins to corrode the wooden table, marking the end of their darkly intertwined fates.
