Prince Kim Ryeowook always told by his father that every prince and princess have their own knight or dame in shining armor. Instead of a knight in shining armor, Ryeowook finds himself a knight but in a dazzling suit with the name Cho Kyuhyun.

— Modern royalty! au in which Ryeowook is a prince and Kyuhyun is an adopted boy by the family who become Ryeowook's knight.