His Mother Beats Him for Being a Naughty Kid, Unaware He Has the Mind of a 21st-Century Genius.

A modern inventor dies in a workshop explosion and wakes up as a newborn baby in Joseon—specifically, as the son of King Sejong the Great. His plan is simple: avoid studying, stay far from the throne, and spend his life on hobbies. But his genius is impossible to hide. He solves puzzles, asks pointed political questions as a toddler, and accidentally impresses every tutor in the palace. When he becomes Crown Prince at seven, he faces a court with no gold, endless paperwork, and a brush that keeps dripping ink on his desk. Instead of tackling grand reforms, he starts with the small annoyance: a fountain pen with a gold nib and a tiny ink channel. He commissions a blacksmith, tests prototypes, and presents the finished pens to his father. The invention wins praise, earns loyal allies, and secures his reputation. But his father's political purges, dangerous in-laws, and a royal succession full of threats mean the young prince must use every bit of modern knowledge to survive. This historical fantasy recap blends reincarnation, invention, palace intrigue, and a child genius outsmarting everyone—while trying not to get buried in books.