Main •
Yoon Kyun-sang as Jang Seon-kyul, a good-looking and wealthy CEO of "Cleaning Fairy" who suffered
mysophobia. •
Kim Yoo-jung as Gil Oh-sol, a girl with a positive personality. She does not really care about dirtiness and possesses a strong stomach. •
Song Jae-rim as Choi Ha-in/Daniel Choi, a psychiatrist from the Rochester Clinic who lives on the rooftop of Oh-sol's house and is known for being a free spirit.
Supporting People around Oh-sol •
Kim Won-hae as Gil Gong-tae, Oh-sol's father. A district cleaner. •
Lee Do-hyun as Gil Oh-dol, Oh-sol's younger brother who is a promising Taekwondo athlete. •
Min Do-hee as Min Joo-yeon, Oh-sol's best friend.
People around Seon-kyul •
Kim Hye-eun as Cha Mae-hwa, Seon-kyul's mother. •
Ahn Suk-hwan as Cha Seung-hwan, Seon-kyul's grandfather who serves as president of AG Group. •
Yoo Sun as Secretary Kwon, Seon-kyul's secretary. • Kim Ki-nam as Secretary Kim
Cleaning Fairies •
Yang Hak-jin as Kim Dong-hyun, a rebellious guy who is good at fighting. •
Cha In-ha as Hwang Jae-min, a dreamer who was chased out of his home. •
Go Geon-han as Jeon Young-shik, Oh-dol's senior at the Taekwondo training center.
Others •
Son Byong-ho as President Yang, Mae-hwa's lover. •
Lee Jin-kwon as President Yang's assistant. • Choi Yoo-song as Bodhisattva Wang, Ha-in's patient who is a fortune teller. •
Ham Sung-min as an action figure collector ==Production==