"The Royal Tutor" is set in the fictional kingdom of Grannzreich, where the royal family faces the challenge of preparing its four princes for their future roles. Each prince possesses distinct personalities and flaws, making their education a complex task. The youngest prince, Prince Licht, is mischievous and rebellious, often avoiding his studies. Prince Leonhard, the second youngest, is aloof and prefers solitude, often seen with his pet cat. Prince Bruno, the second eldest, is studious and serious but struggles with social interactions. The eldest, Prince Kai, is a womanizer with a carefree attitude, often neglecting his responsibilities.

To address these challenges, the king appoints Heine Wittgenstein, a small-statured but highly intelligent and strict tutor, to educate the princes. Despite his unassuming appearance, Heine quickly establishes his authority and earns the respect of the princes through his sharp wit, patience, and unconventional teaching methods. Each prince undergoes personal growth as Heine tailors his approach to their individual needs, addressing their insecurities and helping them overcome their weaknesses.

The narrative unfolds through episodic arcs, focusing on the interactions between Heine and the princes, as well as their relationships with each other. Themes of duty, self-discovery, and familial bonds are explored as the princes confront their fears and responsibilities. Heine’s mysterious past and his connection to the royal family add an element of intrigue, gradually revealed throughout the series. The story balances humor, heartfelt moments, and light drama, creating a cohesive and engaging narrative centered on the princes' development and their evolving dynamic with their tutor.