Ko Eun-ji (고은지), better known as Koeun (고은), is a trainee in SM Entertainment, and a member of a pre-debut training team named SM Rookies, established in 2013. She was introduced on July 8, 2015.

She was born on March 18, 1999 in Seoul, South Korea.

In April 2017, she was featured in Yesung's "Paper Umbrella" music video, along with a fellow SM Rookie Jungwoo.

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