I Transmigrated Into a Book and Became a Legend

After transmigrating, he became a disposable character in a book. Seeing the displeasure on the Crown Prince's face, he immediately donated the treasured family heirlooms. "The country is in peril. I beg Your Highness to let this humble citizen serve his country!" The capital's biggest wastrel changed overnight. He could do everything from military affairs to agriculture and government. Minister: "Who came up with this idea? It's all just armchair strategizing!" The Crown Prince shot him a threatening look. "Do as he says." Why do I feel like His Highness the Crown Prince admires me more and more? =V=