In her past life, Su Miao, the legitimate daughter of the Duke of Zhenguo's household, trusted the wrong people. She was schemed against by her half-sister Su Mingyan and the Crown Prince Rong Yu, her family was destroyed, and she died miserably in the cold palace. Meanwhile, Qin Yan, the God of War whom she had misunderstood her entire life, died on the battlefield defending her remains. As she closed her eyes in bitter resentment, she gazed at his bloodstained figure, consumed by bone-deep regret. Reborn in a single moment, Su Miao returns to the turning point of her fate—the night she was set up and sent into Qin Yan's bed. This time, she sheds her lovestruck naivety, leaving only the cold gleam of revenge and the obsession to protect her family in her eyes. She takes the initiative to propose an alliance with Qin Yan: "help him seize power" in exchange for "protecting her family." Yet she does not know that this man—cold on the outside, mad within—has already returned carrying memories of both lifetimes, on a journey of mutual devotion.