[A haughty young lady who secretly plans every move vs. a cruel, lovesick hostage prince who puts the heroine above all else]
In her previous life, Xue Yumi schemed her way to becoming empress of Wei. But her brother died because of the emperor's stupidity. She resolved to poison the emperor, only for her younger sister to switch the poison she had prepared. Xue Yumi died in the palace hall.
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Reborn, all she wants is to protect her brother and live in peace. Instead, she gets entangled with Jinyun Qi, the future ruler of Xiyue, undefeated in war and a madman who massacres and burns cities, and invents a hundred tortures that leave people unable to live or die.
The madman is still young, beautiful, and frail. Xue Yumi originally intends to avoid him, but he seems so pitiful that she can't help wondering: if she guides him well, could she turn him into a saint untouched by the world's grime, pure as untrodden snow?
Later, just as she sees that the madman is still cruel and murderous and wants nothing more than to get away from him, he kneels before her and plunges a knife into his own body. "Ami, I was wrong. You can punish me however you like, just don't ignore me."
In the end, the madman becomes a wise ruler, and Xue's family flourishes under her brother's leadership. With her life secure and peaceful, she wants to retire to the mountains, but Jinyun Qi's expression turns wild. "Ami, the price of becoming a wise ruler was having you by my side. Whether in heaven or in hell, you must stay with me."