Han Hyo-joo
Go Eun-sung (Han Hyo-joo) was studying overseas in New York and returned to Korea during her vacation to bring her autistic brother, Eun-woo (Yeon Joon-seok), to the United States to study music. Sunwoo Hwan (Lee Seung-gi), who was also studying in New York, was ordered to return to Korea by his grandmother, Jang Sook-ja (Ban Hyo-jung), to learn how to manage her food company. Eun-sung and Hwan, who were on the same flight back home, accidentally had their luggage bags exchanged, which led to several misunderstandings between the two.