The King of Yesterday and Tomorrow tells the tale of how Emperor Yung Cheng and Lui Sei Leong are accidentally transported 200 years into the future into modern day Hong Kong. Now, you can just imagine the reactions of these two Ching period characters when they wake up to find themselves in a totally unfamiliar environment. But that’s when we also get to see the differences between Yung Cheng and Lui SeiLeong. Being emperor, Yung Cheng chooses to observe his surroundings and is calm and composed albeit a little apprehensive. Lui Sei Leong, on the other hand, having been brought up with only one thing in mind, is bent on assassinating the emperor and reviving the Ming. She doesn’t care where or what time period she’s in! This, of course, results in a series of hilarious incidents involving the both of them. Yung Cheng assumes the identity of a Lee Tai Ha and is taken in by his uncle and family, while Lui Sei Leong joins a martial arts performing troupe.