刘宋元嘉年间，天下积弊积弱，监国刘义康羽翼未丰，为改变时局，他暗中蛰伏，走访民间，邂逅了正义善良的骊歌（李沁饰），两人联合智斗为害一方的士族陆家，情愫暗生。为打破士庶隔阂，刘义康（秦昊饰）联姻将门沈家，此人恰是骊歌。刘义康心怀天下，推新政以安民，拔庶族、劝学兴农等措施触及士族利益。面对士族凌威，伉俪二人联手制敌，却先后遭到陆、谢、王三大家族势力扑压，内忧外患接踵而至，刘义康被逼至绝境。骊歌始终陪伴在侧，輔佐他力輓狂瀾、推行新政，兩人的感情浴火彌堅，最終開創了一片盛世昌榮。
During the Liu Song dynasty, powerful aristocrats have taken control of the government, throwing the country into chaos. To change this, Chancellor Liu Yikang (Qin Hao) introduces new policies for political reform. To break the alliance between the aristocrats, Liu Yikang enters into a marriage alliance with the Shen family, who has roots in the military. His fiancé turns out to be Shen Lige (Li Qin), whom he has previously met at a dance house. After marriage, Li Ge assists Liu Yikang in dealing with their political opponents and implementing new policies. However, in response, the aristocrats ally together to suppress Li Ge and the Shen family, who is later massacred. Pained by her loss, Li Ge vows to take revenge for her family.
劉宋元嘉年間，天下積弊積弱，俠女沈驪歌（李沁飾）不解監政彭城王劉義康（秦昊飾）暗中蟄伏之志，誤以為其縱容奸佞，禍患朝堂，欲借太妃壽宴獻舞之機將其刺殺，不料卻淪為劉義康和姦佞陸遠（戚跡飾）生死相奪的棋子。陰差陽錯之間，驪歌成為沈家將門嫡女，並與劉義康聯姻。劉義康和驪歌民間相遇，共同調查陸遠，不明身份的兩人幾經患難，情愫暗生，卻囿於婚約只能忍痛惜別。大婚之夜，刺殺之時，四目相對，情仇難辨！陸遠與太妃合謀治罪沈家，劉義康與驪歌化解誤會，力破死局！邊關秋犯，劉義康征戰，陸遠暗算，驪歌千里奔赴沙場力挽狂瀾，助劉義康凱旋歸朝。朝堂之內又遭到謝、王家族勢力撲壓，伉儷二人攜手制敵，感情浴火彌堅，共同守護一片盛世昌榮。山野爛漫，梨花盛開，愛人攜手，共賞繁華……
劉宋元嘉年間，天下積弱，俠女驪歌誤以為監政劉義康縱容奸佞，禍患朝堂，欲將其刺殺，不料卻淪為朝臣生死相奪的棋子。及後，驪歌陰差陽錯成為沈家將門嫡女，並與劉義康聯姻。二人幾經患難，終化解誤會，克服困局。
