You Marry the Enemy, I Become the Emperor

Prince Zhang Xuan of Great Qian is framed by his brothers and forced to exile to Northern Liang for marriage. En route, he is attacked and saved by the rumored mad Northern Liang Princess Qin Yunshu. They make a pact: he helps her seize the throne, she aids his revenge against his homeland. Facing the step-by-step killing intent of Northern Liang's Prince Jing, Zhang Xuan uses his medical skills and wisdom to break the deadlock, and he and Qin Yunshu fake a play to become truly married. He reforms bad policies and wins the hearts of the people; she secretly lays plans and consolidates power. When Prince Jing assassinates the king and usurps the throne, the two team up to counterattack. Zhang Xuan cleverly exploits the contradictions between the two countries, finally helping Qin Yunshu ascend to the throne and leading the army south to reclaim Great Qian. The two heroes stand together, the two countries unite, and a peaceful prosperous age is established.