Sing if you sing, dance if you dance! Joo Yeon is the vocalist of the band 'Butterfly Effect' who has everything she can’t do. Hit by reality and quitting music, her father's terminal sentence suddenly hit her! She falls apart. The last wish of the terminally ill father is to see Joo Yeon on TV before he dies! In order to grant her father's last wish, Joo Yeon decides to stand on stage again with the genius guitarist and friend Seung Gi... No strings, with passion! The challenge for the success of the indie band 'Butterfly Effect' begins!