The King of Yesterday and Tomorrow is a Hong Kong television drama serial that originally aired on Jade from 27 January to 21 February 2003. According to legend, Yongzheng Emperor of the Qing dynasty may not have died of natural death and was actually assassinated. The plot is an imaginative time-traveling story based on the continuation of what happens after the assassination attempt.

The drama is produced by TVB under executive producer Siu Hin-fai. With an average of 2.21 million viewers, the drama is the fourth highest rating drama series of 2003. It received five nominations at the TVB Anniversary Awards, winning four. Maggie Cheung Ho-yee won the TVB Anniversary Award for Best Actress and one of twelve My Favourite Television Character awards, while Paul Chun won My Favourite Powerhouse Actor. Kwong Wa was nominated for the TVB Anniversary Award for Best Actor, and won one of twelve My Favourite Television Character awards.