One of the most talked-about girl groups in Korea right now ――SYMPHORIA. Three years since debut. They won a Rookie Award with their debut song "Symphony," and in their second year, "Luminous" became a huge hit. Now, they have grown into a popular group with many fans not only in Korea but also in Japan and overseas. Soa, Jiyun, Yerin. And one more. A unique music born from the overlapping personalities of the four. And the fans who support the four are――HARMONY. But even the form of "four," which now seems so natural, had a beginning. The days when the four, who were still nobodies, met, overcame differences in language and culture, sometimes laughing, sometimes clashing, while chasing their dreams together. ――This is the story of those four. And now. You, as the fourth member of SYMPHORIA, open the pages of this story. Music that would never have been born if the four hadn't met. Continuing that story, together with you――.