Prince Kim Yongsa’s Muscle Kingdom, also known as 왕자 김용사의 근육왕국, is a gripping web novel in the Korean language that follows the story of a Muscle Warrior who returns as a failed 7th Prince. Packed with action, fantasy, martial arts, and supernatural elements, this novel will keep readers on the edge of their seats. The protagonist is a confident and hard-working prince who faces challenges involving demon lords, demons, and a journey from weakness to strength. With themes of nobility, royalty, time travel, and transmigration, this novel offers a unique and engaging reading experience for fans of the genre.