Tyrant, I Swear Not to Be My Concubine

"If you don't come back, I will kill everyone who remembers you and treat you as if you never appeared." Thousands of years ago, he warned her like this. She just smiled faintly and left him, not seeing the first tear he shed in his life. Thousands of years later, she accidentally stepped into the ruins of this ancient demon kingdom, but she traveled back in time five hundred years ago. At this time, he was the prince of the Celestial Dynasty, as cold and ruthless as ever, without tears. And she, Tang Qishao, became a woman disguised as a man, and owed a debt of love to the silent and reserved bodyguard beside her. When the remains of the Demon Kingdom come to her, will she be able to remember the man who was full of sorrow but unable to shed tears? When the identity of the demon is revealed one by one, can she recognize who the guard who has been silent all this time is? When the past grudges were slowly revealed, she realized how big a mistake he had made after she left!