I Spent a Night with the Heavenly Demon's Only Daughter

A coworker I happened to spend the night with said. “Hey, Head Instructor Cheon! You! Do you know who my father is?” “Why? Did your mother not tell you?” At that time, I didn't know. That my coworker's father was the Supreme Leader of the Heavenly Demon Divine Cult. — Description from novelcodex.org