Actor Suh Ji Suk of kdrama Gloria returns as Kim Yi Han, Seoul's number one male nanny, also known as a "Manny". With the perfect physical and academic qualifications, he is hired by Seo Do Young, played by actress Choi Jung Yoon of kdrama Attic Cat. Yi Han lives with Do Young as a live-in manny. He is hired to look after Eun Bi and Jung Min, her two young children, but unexpected romance blooms between the mother and hired help.