The core political conspiracy stems from the past death of Crown Prince Lee Soo (Yul’s father), which led to the current Emperor taking the throne and exiling Yul and Lady Seo to England. Lady Seo returns to Seoul plotting to frame Crown Prince Shin and seat Yul on the throne. As Shin and Chae-kyeong navigate their burgeoning romance, Shin's ex-girlfriend Min Hyo-rin attempts suicide over heartbreak, causing a media crisis. Lady Seo then orchestrates an arson attack within the palace to frame Shin for treason.
Upon discovering his mother's illicit past romantic entanglement with the current King and seeing the collateral damage inflicted on Chae-kyeong, Yul publicly takes the blame for the fire conspiracy, exonerating Shin before leaving the palace in exile with his mother. Shin abdicates his immediate right to the throne in favor of his progressive sister, Princess Hye-myeong. Chae-kyeong moves to Macau to study design, where Shin joins her; free from royal constraints, the two marry in a private, genuine ceremony. A post-credits scene hints that Chae-kyeong is pregnant, providing a definitive romantic closure.