Seo Hye-in (서혜인),better known as Herin (헤린), is a former trainee in SM Entertainment, and a member of a pre-debut training team named SMROOKIES, established in 2013. She was introduced on July 8, 2015.

She was born on February 26, 2002 in Manchester, England, United Kingdom.

In July 2017 Herin left SM Entertainment and joined the survival show Idol School, however, the company has yet to make an official statement about her leaving.

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