Don't be afraid, I'm not a devil

"Don't be afraid, fairy, I'm not a devil."
"But your blood sea vision, bone palace, billions of soul flags, and the world-destroying demon sword all prove that you are a demon."
"Fairy, you are obsessed with this. In fact, I am a good man with a knife. The man I just killed is the devil."
"...He is my husband-in-law!"
Ji Changsheng's eyes lit up.
This is really wonderful.