Han Tae-hee (Joo Sang-wook) is the right-hand man of the chaebol SJ Group. He suffers from "broken heart syndrome" after suffering a mental shock. In order to find his beloved woman Jo Chae-yeon (Wang Ji-hye), Tae-hee transformed the obese housewife Sa Jin-ran (Ha Jae-sook) who was abandoned by her husband Lee Kang-joon (Jung Kyung-woon) into the extremely beautiful Sarah (Han Ye-seul). Then, in the process of getting along with this woman transformed by himself, he gradually fell in love with her, and the two of them will embark on a romantic love with twists and turns.