He is a messenger from hell, with a demonic heart beneath his gentle and handsome face. She was born on the bank of the Lethe River, with a kind heart and a simple temperament. A thousand years ago, by the Lethe River. She asked him desperately, "Why did you deceive me?" His face was expressionless, and his words were like frost: "I'm sorry, where the duty lies!" A thousand years later, on campus on earth. She looked at him with a playful face: "I just like you!" He frowned and looked at her with disgust: "If only you could put this mind on studying!" Ten years later, in the midst of the chaos of the world. She had gray hair and a hoarse throat, like a dying old man. He is still young and handsome, and he has a little more manly touch than he did ten years ago. She looked at him in front of her, and couldn't remember who he was. He stared into her eyes and said in a sad and affectionate tone: "I love you!" Her heart ached inexplicably in an instant, and tears rained down. It turns out that our fate is not limited to this life. It turns out that our love and hate span millennia. She traded her soul with the Demon King in exchange for staying with him for the rest of her life, and she wanted to hear him say that he had never lied to her, that he had done so a thousand years ago, and that it would be the same a thousand years later. It's just that our fate ends in this life. Love is not cause and effect, fate is destined for life and death.