The Simpleton Prince's Revenge

A modern man time-travels, becoming Ethan Hawthorne, the simpleton prince. He takes blame for Princess Seraphina Sterling. Using modern knowledge, he outsmarts the powerful. His transactional engagement with the princess blossoms into affection. After his father is poisoned by the Empress Dowager, Ethan Hawthorne allies with Princess Seraphina Sterling, his sister-in-law, and Lady Crystal. He confronts the Empress Dowager, overthrows villains, ascends the throne, ushering in a prosperous era.