The Inso Laws

Throughout the comic, Ham Dan-I is consistently making reference to the fact that the world around her is within an Inso 인소 (Korean for webnovel) and one of the ways she does so is by occasionally bringing up "the Inso's Laws".

Fun Fact: In episode 43, Dan-I gets shocked by Ji-ho's insightfulness and makes a joke about him making a "Ham Dan-i's Law No.XX" like how she normally comes up with "Inso Law No.XX".