LUMINOUS (루미너스) was a 4-member boy group under SE Group Entertainment (formerly Barunson WIP). The group consists of: Youngbin, Suil, Steven, & Woobin. They released a pre-debut album on August 19, 2021. They officially debuted on September 9, 2021 with the album “'YOUTH” and the lead single “RUN”. The group disbanded on February 9, 2025.