Prince Yi
In 1720, his father King Sukjong died and Crown Prince Yi Yun, Sukjong's eldest son, ascended to the throne as King Gyeongjong, at the age of 33. When Sukjong died in 1720, he supposedly told Yi Yi-myoung to name Yeoning-gun as Gyeongjong's heir, but in the absence of a historiographer or scribe, there was no record  .