Mnet
Are you aware of ex-SM Rookie and Mnet "Idol School" participant, Seo HeRin?
Many would recognise her as she was introduced as part of SM Rookies back in 2015.
SM Rookies
She had also appeared on Disney Channel "Mickie Mouse Club" when she was a trainee under SM Entertainment. Many had then anticipated for her debut under a new girl group from SM Entertainment.
However, around 2017, many of her fans were left in shock as it was said that she had left the agency and signed up as a participant for Mnet "Idol School".
Mnet
During the show, she had showed off her vocal skills and potential to debu
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