Set in the Joseon Dynasty, a mischievous taoist named Jeon Woo-chi acquires a powerful magic flute and uses his abilities for personal gain, often testing the patience of the celestial beings tasked with maintaining order in the world. Woo-chi's antics draw the ire of the Goblins, who also covet the magic flute and initiate schemes to wrest it from him. Amid the ensuing chaos, Woo-chi gets entangled in a web of dark sorcery and political intrigue, leading to the framing of his mentor for murder and ultimately Woo-chi's imprisonment in a scroll by the three divine Taoist wizards.

Centuries later, in modern-day Korea, the seal on the scroll is accidentally broken and Woo-chi is unleashed into a world vastly different from his own. The celestial beings who once imprisoned him find themselves in need of his powers to combat a newly awakened evil. They convince the mischievous taoist to help, promising to clear his name and restore his lost honor in return. As Woo-chi navigates the complexities of the modern world, his path crosses with that of a reincarnated princess from his past life, adding layers of romantic tension and comedic moments to his quest. However, Woo-chi's true challenge lies in confronting the same dark forces that marred his past, pushing him toward an epic confrontation that will determine his destiny and the fate of the world.