Fair Princess Jungmyung lives a life of the highest privilege, until her half-brother Prince Gwanghae executes the rightful crown prince and usurps the throne. Exiled from court, Jungmyung goes under disguise as a man and learns to adapt to life as a commoner — never forgetting Gwanghae's wrongdoing. But amidst rampant corruption throughout the kingdom, can Jyungmyung exact her vengeance, restore order and take back her rightful place in the palace?
Princess Jeong Myeong was the only direct descendant of King Seon Jo still alive, and when she was born, her birth was celebrated around the palace. She had the sweetest smile a baby could have. Queen In Mok was relieved that she had a baby girl instead of a boy. According to the seer Nam Sa Go, the baby she carried would become the true ruler of the Joseon Dynasty, a king of kings and have a princess, which proved the prophecy to be wrong.
But the turbulent times took a heavy toll on Princess Jeong Myeong. Upon the death of King Seon Jo, Gwang Hae ascended the throne, and his first order of business was to eliminate Prince Yeong Chang and banish Queen In Mok from the palace. Then his next target was Princess Jeong Myeong. When In Mok learned that her daughter’s life was in danger, she sent her into hiding. But assassins tracked Jeong Myeong down. Through the heroic sacrifice of her bodyguard, Jeong Myeong was put on a boat that sailed adrift in the sea. Meanwhile, the bodyguard and nanny set their boat ablaze and died to fool the assassins. Jeong Myeing witnessed her nanny and bodyguard consumed by the flames. Adrift on the boat, Jeong Myeong lost consciousness and was picked up by a merchant boat crossing to Dejima in Japan. She was sold as a slave.
To survive in the hostile environment she hid the fact that she was a princess. She also vanquished her memories of ever being a princess so that she could focus on how to get revenge. Posing as a boy, Jeong Myoeng worked as a laborer in the sulfur mine. But she discovered hope in the depths of her despair. It was a friendship with Ja Gyung that helped her cling to life. But she never lost her focus on returning to Joseon one day and bringing the downfall of Gwang Hae, who had taken everything away from her. Then an opportunity arose. She began peddling information and secrets in the sulfur mines. Leveraging her strategic location, she followed the Joseon delegation visiting Japan back to Joseon. Finally, her dream to return to Joseon had come true…