Yi Ji (Korean: 이지; Hanja: 李祬; 31 December 1598 – 22 July 1623[1]), or firstly named Yi Su (이수; 李修) and sometimes spelled as Yi Jil (이질; 李祬), was a Korean Crown Prince as the second son (formally as first son) of Gwanghaegun of Joseon and Deposed Queen Yu of the Munhwa Yu clan.
There was one daughter named Yi Ah-gi (이아기; 李娥其) who was born in 1618, and was the only surviving child of the crown prince.
In the end, about two months later in April (May of the lunar calendar), Yi Ji was digging a tunnel to escape.
His wife committed suicide in June 1623 (lunar calendar May); the third day after her husband was arrested.
Then on 22 July, a month after his late wife's death (In the Korean calendar (lunar) was 25 June), he died from hunger.