Gil Oh-so, an employee at a cleaning company, meets Jang Seon-gyul, the boss of the company. The two are diametric opposite when it comes to cleanliness. With the help of Oh-sol, Seon-gyul faces his mysophobia and falls in love with her.
O-sol hears that Seon-gyeol is leaving for the U.S. O-sol’s family receives an overdue apology. Seon-gyeol wants to start over, but it may be too late.