During the confusing and conspiratorial Joseon Dynasty King Gwanghae orders his councilor, HEO Kyun, to find him a double in order to avoid the constant threat of assassination. HEO Kyun finds Ha-sun, a jester who looks remarkably like the king. Just as feared, Gwanghae is poisoned. HEO Kyun proposes Ha-sun to fill the role as the king until Gwanghae recovers fully and grooms Ha-sun to look every bit like the king. While assuming the role of the king at his first official appearance, Ha-sun begins to ponder the intricacies of the problems debated in his court. Being fundamentally more humanitarian than Gwanghae, Ha-sun’s affection and appreciation of even the most minor servants slowly change morale in the castle for the better. However, his chief opposition, PARK, notices the sudden shift in the king’s behavior and starts to ask questions.