Princess in the Iron Mask

She was able to bring peace to the country with her literary skills, and her country was determined with her military skills. She was born as a daughter by mistake. Although she was a princess of a country and the most beloved daughter of the emperor, her appearance was completely ruined due to an accident when she was young. She only showed herself in an iron mask all year round. He was handsome and charming, talented in literature and military, worthy of being the lord of a country. He held the highest authority, but he was so cold, bloodthirsty and brutal. But why was there always an unknown and inexplicable pain in his eyes. They were supposed to never meet, but God's will played a trick on them. One became the princess of a subjugated country, and the other vowed to rule the world. What kind of story will happen between them?