Go Woon

Go Woon originally debuted in VIVIDIVA with their debut digital single "Service", under the stage name Sun Yul and was a member of the group until their disbandment in March 2016. Afterwards, she was expected to debut in a new group called Twinkle after their appearance in MAN3E's (Elephant Entertainment's boy group) music video, but never materialized. She re-debuted as a member of SHA SHA in 2018 with their debut single "You & Me Forever SHA SHA" under her real name Go Woon and continued in the group until their disbandment on July 17, 2019.

On February 11, 2020, she made her solo debut under SemirMusic, with the digital single "Something". Shortly after, she released her second single, "After Farewell", on February 25, and her third single, "Wish", on April 28. She released her fourth single "Call Me" on June 10, under a new label, MilreSound.