Xiao Poye, the undefeated warrior king of the grasslands, dies in battle defending his country. His spirit witnesses his wife, Fu Zhiyao, forcing his concubines to be buried alive with him and attaching herself to the new emperor. Filled with resentment, he is reborn at the age of twenty. Meanwhile, Fu Zhiyao, who was framed by her family, married off to a distant land, and poisoned, also returns to the age of eighteen with lingering hatred. Xiao Poye sets out for the Central Plains, consumed by murderous intent and seeking revenge. The two meet earlier than in their previous lives. After several rounds of suspicion and testing each other, they uncover the secret of their shared rebirth and discover the hidden truths behind one another. Xiao Poye abandons his murderous intentions and resolves to protect her, while Fu Zhiyao lets go of her prejudice. Together, they settle accounts with her treacherous father and brothers and the treacherous emperor, quell internal turmoil, and repel foreign enemies. With her intelligence and courage, Fu Zhiyao ascends the throne as empress in her own right, while Xiao Poye remains faithfully by her side. The sworn enemies of their previous lives ultimately become each other's one and only beloved, staying together for the rest of their lives.