In the early 11th century, the Goryeo era. A princess named Lee Hwa who was only 18 years old began to realize that her stepmother whom she loved was slowly killing her over the past 10 years. In order to survive the death that haunts her, she leaves Gaegyeong City and relies on a letter given by her teacher. The princess takes an arduous journey to Haeju City to meet a man named Yang Sa-Eon, one of the students most trusted by their teacher.