Yi Seong-deuk (Korean: 이성득; Hanja: 李成得; 1775 – 27 November 1817) was a royal family member of the Later Joseon dynasty periods and a national offender.
His birth and the reign[clarification needed] of his great-grand father King Yeongjo are known, but most of his lifetime evidence is destroyed; his early life and childhood are unknown.
possibly Yi Chul-deuk was born to his mother or Lady Lee of Jeonsans.
In 1786, his elder half-brother Yi Jun, Prince Sangkye was adopted by the 22nd King Jeongjo, by Hong Kuk-yeong.
On November 27, 1817 he died from aftereffects of torture in Ganghwa County office,[3] but his unknown also annihilate of more his records and related of Prince Euneon and Prince Sangkyes in ruled time of King Cheoljong and emperor Gojong times.