Choi Sooyoung and Kim Taeyeon are bestfriends since 7 years old. They treat each other like they're sisters. They once meet and lived in America and has 2 childhood friends, Jinki and Kibum. When they reached 12 years old their parents decided to live in Seoul, Korea for business purposes. They left Jinki and Kibum but promised each other that they'll never forget their friendship. When they arrived in Seoul the