To put it simply, it is a love story between a fox demon and a human. Who said demons are cold-blooded by nature? I would say that demons are the most affectionate. If a demon is touched by the word love, he will never leave her for life.
He said so many love words, but it turned out that every word was a promise. A gentleman's promise would be kept by him throughout his life, to protect him and keep him safe for the rest of his life.