Youngseo

Sometime in 2019, Youngseo joined Source Music and started training with the pre-debut group NTeam and trained with them for four years. After postponement in their debut, Youngseo left Source Music in sometime 2022. On June 16, 2023, Youngseo was introduced as a contestant on Belift Lab's girl group survival show R U Next?.

During the show's finale, she was revealed to have ranked 2nd overall, thus making her a member of ILLIT. She left I'LL-IT on January 5, 2024, after she terminated her contract with Belift Lab. On June 6, 2025, it was announced that Youngseo has signed with The Black Label and is expected to make her debut soon with the agency's upcoming co-ed group.

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