Jang Sun-gyeol is a wealthy and handsome CEO of a cleaning company who suffers from severe mysophobia, an intense fear of germs. He treats cleaning as a sacred calling and refuses to touch anything or anyone he deems unclean. His life takes a chaotic turn when he crosses paths with Gil Oh-sol, a bright, energetic, and perpetually disheveled job seeker who has long abandoned the idea of cleanliness in the face of her difficult life circumstances. As their worlds collide, Sun-gyeol is forced to confront his deep-seated anxieties and the trauma that caused his phobia, while Oh-sol struggles to find her footing in the professional world. Their relationship evolves from mutual frustration to a heartwarming romance as they learn to heal each other's emotional wounds. Along the way, they must navigate family secrets, corporate intrigue, and the challenges of accepting imperfection in a world that demands order.