Please Read the Fine Print If You Want to Learn About Immortality.

The female protagonist traveled through time. Before that, the original female protagonist had been bullying the male protagonist. Later, the male protagonist and the female protagonist fell in love with each other. As a result, the male protagonist awakened and was a young demon master. The male protagonist mistakenly thought that the female protagonist had drugged him, so he fell in love with her. He kept insulting the female protagonist. Later, the female protagonist became pregnant.