Yooha Lim, a 24-year-old job seeker, returns to her family home in tears after a series of failed job applications following her college graduation. There, she runs into Jimin Kyu, the youngest son of the landlord family—and the household troublemaker. On their first meeting, he bluntly asks, "Are you the new housemaid?"—rude and disrespectful right off the bat. Living under the same roof as this spoiled brat was the last thing she wanted... Romance? No way! There's a line between us—and it’s not meant to be crossed.