Im Jeong-gyu is a South Korean singer, dancer and former member of SEVEN O'CLOCK (세븐어클락). He made his debut in 2017 as the group's lead vocalist and sub-rapper with their 1st EP "Butterfly Effect." In late 2019, he went into hiatus due to health issues and, from that point until the group disbanded in March 2021, he never reintegrated to the group's activities.