"I dare not entrust my sincerity to you because I am afraid of betrayal."
"I have been sleeping for a thousand years. I don't know what the world is like now or what kind of person you are."
"Where is the right messenger? No, where is the demon master?"
"When did this demon world change its owners?"
A thousand years ago, there was a great war between gods and demons. The Demon Lord fought against hundreds of thousands of heavenly soldiers with one man, but was betrayed and sealed for a thousand years.
"My heart has been waiting for you for a long time."
It's nothing more than a female protagonist who doesn't care about worldly things vs. A naive male protagonist in the early stage and a domineering ghost in the later stage.