Mawangui Segyejeongbogeun Cheoeumbuteo Geulleomeogeotda

One day, an uninvited guest suddenly appears! She is none other than the Demon Lord Karin! Jeong-Ha's daily life begins to fall apart due to the tyranny of this nuisance. Why did Karin come to see Jeong-Ha? Will Jeong-Ha's daily life ever be peaceful again?

(Source: Ridibooks, translated)