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, using Zhuang Yu'er (Yong Hong) as bait to capture Hongli. Yongzheng had no choice but to visit Zeng Jing (David Chiang) three times in person, and she revealed a shocking secret. It turned out that Hongli was the son of Yongzheng and Lu Siniang (Sheryl)! Zeng Jing decided to agree to rescue Hongli because she loved Siniang deeply. When Hongli ascended the throne, he became obsessed with power and forgot about the past kindnesses. He started killing people, making the situation out of control.