Twenty-four-year-old job seeker 'Im Yu-ha' returns home in tears after graduating from college, unable to bear the consecutive failures in finding a job. The person she encounters there is the youngest son of the landlord and a troublemaker 'Ji Min-gyu'. Upon meeting him for the first time, he immediately starts rudely asking, "Are you the new helper who came in today?" Living under the same roof with the reckless young master whom she absolutely did not want to get involved with... Manse? Absolutely draw the line! The line that you and I must not cross.