Myung-ha is a young man who was abandoned by his family and lives alone in the mountains to protect his ancestor's grave. One day, his father told him that he would recognize him as his legitimate son in exchange for fulfilling a simple task. However, his duty is to marry Prince Howon and live in his house. Thankfully the prince treated him well, but at night, he behaves like someone else. What good will this strange marriage do for him?