Yongzheng (Law Lok-lam) wants to pass the throne to the fourth prince Hongli (Louis Koo). The second prince Hongshi (Ho Po-sang) and his confidant Zhou Jingan (Daniel Summer) learn about this and team up with the seventeenth prince Yunli (Lok Ying-kwan) to use the underworld secret organization Xianmingtang to set a trap and capture Hongli with Zhuang Yu'er (Yong Hong) as bait. Yongzheng has no choice but to visit Zeng Jing (David Chiang) three times in person and reveal a shocking secret. It turns out that Hongli is the son of Yongzheng and Lu Siniang (Sheryl)! Zeng Jing, who loves Siniang deeply, decides to agree to rescue Hongli. When Hongli ascends the throne, he becomes obsessed with power and forgets his past kindness. He starts killing people and the situation becomes out of control...