The World Is Still Beautiful (TV Series)

Nike, the fourth princess of the Rain Dukedom, holds the power to call forth the rain. She travels to the Sun Kingdom to marry Sun King Livius for her country, despite her own reluctance in the matter. She soon discovers that the King, who conquered the world in only three years after his ascendance to the throne, is still a young boy. Despite being total strangers at first they start to understand one another and develop an emotional bond with each other.