Splendid Politics (2015)

Fair Princess Jungmyung (Lee Yeon Hee) lives a life of the highest privilege, until her half-brother Prince Gwanghae (Cha Seung Won) 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 Jungmyung exact her vengeance, restore order and take back her rightful place in the palace?