Key to the Phoenix Heart Episode 4

During the rebellion of the powerful feudal lord of Dayou, the realm descends into chaos, and warlords rise across the land. Xiao Wu Yi, the cold and ruthless commander general of the Northern Army, sets up a scheme for the hand of Xie Jia Yu, the money-driven, crafty only daughter of the Grand Tutor Xie Huai Gui, in order to quell the rebellion of the Duke of Changsha.Bound by a marriage ordained by royal edict, it is an arrangement crafted not for love, but to serve hidden agendas, where every gesture masks a scheme and every move is calculated in a greater game of power. From a contractual couple to lifelong partners, from suspicion and conflict to love and unity, they go from rivals in ambition to comrades in life—uncovering each other's secrets amidst a deadly game.(Source: MyDramaList)