This is king’s official order of appointing Uiso (1750-1752) as a grandson-heir apparent in May 1751 (year 27 of Yeongjo). Uiso was the eldest son of the crown prince Jangheon, and was Jeongjo’s brother. He was appointed as a grandson-heir apparent when he was one year old, but passed away next year March. The book which has three kinds of silk around the cover such as blue cloud pattern silk, and has colorful ropes and jade knob shows the majesty of king’s order. The text was written by Yi Cheon-bo, a civil servant at Yemungwan.