Seven O'Clock (Hangul: 세븐어클락; also known as 7 O'Clock, 7OC or SOC) is a South Korean boy group under STARO Entertainment. The group consists of five members: Hangyeom (Formerly A-Day), Hyun, 2Soul (Formerly Younghoon), Jeonggyu, and Taeyoung. They released their debut extended play, Butterfly Effect, on March 16, 2017, with 시계바늘 (ECHO) as its' title track.

On October 2017, the members decided to audition on JTBC's survival reality show, MIXNINE, where only A-Day and Vaan (participating as Song Hangyeom and Kim Sangwon respectively) passed. Vaan ended up ranking 31st and was eliminated from the show, while A-Day ended up on rank 6th, getting the chance to debut with the final group. However, on May 2018, it was announced that the MIXNINE final group was cancelling their debut.

On September 19, 2018, it was announced that Vaan had officially left Seven O'Clock. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.