郑兰贞（姜受延 饰）的体内流淌着高贵的皇族血液，却在阴差阳错之中被一位官员的妾室所收养，因此遭受了无尽的排挤和嘲笑。吉尚（朴尚民 饰）是郑兰贞青梅竹马的玩伴，两人之间产生了真挚的感情，然而，这份感情却被旁人从中作梗，两人分道扬镳。
郑兰贞被裹挟在朝廷的剧变之中身不由己，最终，她决定主宰自己的人生，嫁给了尹元衡（李德华 饰），甘为他的偏房。尹元衡的姐姐（钱忍和 饰）加入王室，一路高升最终成为了文定王后，而郑兰贞则联手文定王后，成为她的左膀右臂，助她除掉了敬嫔（都知嫄 饰）等一干阻碍两人政治道路的人物，最终在朝堂之中站稳了脚跟，夺回了她曾经失去的一切。
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