Informed that Prince Anxi has long planned to rebel, the court has Zou Hualong and Jiang Liuyun infiltrate into his mansion as spies. Full of envy for the highly regarded Liuyun, eunuch Bala leads him into the forbidden Baihua Pavilion, where trespassers are punished and beheaded.
Prince Anxi’s daughter practices fencing at the pavilion, which is off-limit to all males.
When she catches sight of the trespasser, the princess is instantly captivated by his talent and graceful bearing. She gives him a sword and the promise of marriage.
When the prince finally revolts, Hualong has Liuyun unwittingly pass misinformation to the princess, lowering her guard. The surprise attack by Hualong that night wipes out the army of Prince Anxi. Although the wounded princess breaks through the siege, the prince and Bala are captured. Aware of the double crossing, Liuyun deeply regrets his involvement.
Hualong prepares to execute the shackled prince in front of his camp. To save her father, the princess surrenders her army, on condition that Liuyun be killed for breaching her trust. Willing to die to prove his innocence, Liuyun is about to commit suicide with the princess’s sword when Hualong intervenes. He manages to clear up all misunderstanding.