Butterfly Effect is the debut mini album by Seven O'clock. It was released on March 16, 2017 with "Echo" serving as the album's title track. Track list "Echo (시계바늘)" "Time Machine" "Halley" "그래 그랬어" "Echo (시계바늘) (Inst.)" Video links "Echo" music video Teaser This article is a stub. You can help Kpop Wiki by expanding it. Retrieved from "https://kpop.fandom.com/wiki/Butterfly_Effect?oldid=146110" Categories: Discography article stubs Albums Mini albums Seven O'clock 2017 releases 2017 mini albums Community content is available under CC-BY-SA unless otherwise noted.