Crown Prince Hyojang was a Crown Prince and noble of Korean Joseon dynasty, first and illegitimate son of King Yeongjo of Joseon and adoptive father of King Jeongjo of Joseon, elder half-brother of Crown Prince Sado, but he died at a young age.
In 1762, 34 years after his death, he was adopted to his half-nephew Yi San by his father King Yeongjo and in 1776 was appointed to the title of Honor King, 48 years after his death. His other title was Prince Kyeongui. His real name was Yi Haeng. His first name was Manbok. His Chinese name was Sungkyung.