Park Bo-eun (박보은), known as BOEUN, is a lead vocalist of CLASSy. She became one of the seven members through MBC’s My Teenage Girl and debuted with the group on May 5, 2022.

BOEUN contributes a lighter vocal register and expressive delivery to the group’s ensemble singing. Her voice helps soften the transition between CLASSy’s more powerful choruses and its quieter melodic sections, while her stage performances bring a confident, youthful quality to the group’s songs.

BOEUN took on a more individual creative role with Intoxicated, her solo track from the June 2026 EP RE:BOOT [AFTER TEARS]. The recording features production by Cha Cha Malone and includes songwriting and composition contributions credited to BOEUN. The song and its official performance clip are part of the group’s comeback project, rather than a separately released solo album.