Hajin And Hara are twins. Hara joined the leading Korean company, Ohsung Group, as a foster daughter. Hajin is given the opportunity to receive as much education as she wants, so she studies abroad in the United States. The twins are separated from each other and live separate lives. Although the two are separated, they remain close. Then one day, there's a sudden call from Hara: "Come back". In a word, Hajin entered Korea, feeling anxious about something…