Premise of Mistaken for Her Kept Man, I'm the Dragon Prince
Prince Karen's Critical Condition
First Prince Karen of the Dragon Clan has depleted his dragonborn abilities while protecting the Northern Frontier. The exertion leaves him near death, making the retrieval of the Dragonbone Heart an urgent necessity rather than a routine errand. His survival hinges entirely on securing this specific artifact within the royal capital.
The Early Arrival Strategy
Karen reaches the capital three days before his official entourage, traveling alone to surprise his younger sister, Princess Lilian. This unscheduled, solitary entry removes the usual protections and protocol that accompany a royal heir, placing him in the city unrecognized and without immediate support.
Title-Implied Misidentification
The series title indicates Karen will be mistaken for a kept man, a status vastly inferior to his true rank. This confusion likely stems from his unannounced arrival and lack of visible retinue, creating immediate tension between his hidden identity as the Dragon Prince and the lowly role others assign him.