[1] In 1263, alongside his older brother, he received his Royal Title of Prince Sunan (순안군개국후; 順安郡開國侯).
[2] As the beloved son, from 1269, he temporarily took over the affairs of the court on behalf of his father, who went to Mongolia and in 1273, he visited the Yuan dynasty as an envoy.
[3][4] At this time, the Yuan's Emperor favored and liked him, then gave him 500 geun (근) and 800 pil Jeo-pho (필) (저포; 苧布).
[5] In 1277, after Wonjong's death, Wang Sim ascended the throne, but there was one report related to the new King, said: He often made small meals and his mother asked Jong-Dong how to prevent evil held a ceremony and buried "Jeon-chan" (전찬; 奠饌) in the ground.
A few days later, the ministers asked for Gyeongchang and Jong's forgiveness, but the King was still tried to end his half family's line by destroyed them.