As a clean freak and germophobe, it was only natural for Seon-gyeol to start a cleaning company. What he doesn't anticipate, however, is the messy girl who crash-lands in his life as a new employee. Oh-sol is a cheery rookie who doesn't mind getting dirty but is unfortunately terrible at cleaning. Although she and Seon-gyeol are polar opposites, fate seems to keep drawing them together in the most hilarious ways. Can Oh-sol get Seon-gyeol to open up his heart and help him overcome his extreme germophobia?