"The Royal Tutor" centers on Heine Wittgenstein, a small-statured but highly intelligent tutor tasked with educating the four princes of the Kingdom of Grannzreich. Each prince possesses distinct personalities and challenges, making Heine's role both demanding and unconventional. The eldest, Prince Licht, is charismatic but frivolous, often avoiding responsibilities. Prince Leonhard, the second eldest, is sharp-tongued and rebellious, with a disdain for authority. Prince Bruno, the third prince, is studious and disciplined but struggles with self-doubt. The youngest, Prince Kai, is quiet and reserved, often misunderstood due to his intimidating appearance and aloof demeanor.

Heine's approach to tutoring is unorthodox, blending strict discipline with empathy and understanding. He tailors his methods to address each prince's weaknesses while fostering their strengths. Over time, the princes begin to grow, not only academically but also personally, as they confront their insecurities and learn to trust Heine. The narrative explores themes of self-improvement, familial duty, and the complexities of leadership, all set against the backdrop of royal intrigue and political maneuvering within the kingdom.

The story balances humor and heartfelt moments, with Heine's mysterious past and the princes' evolving relationships adding depth to the plot. As the princes prepare for their future roles, Heine's influence becomes pivotal in shaping their paths, highlighting the transformative power of education and mentorship. The series maintains a focus on character development, with each prince's journey contributing to the overarching narrative of growth and unity within the royal family.