Sunn (선) is a South Korean rapper. She is a former member of the girl group Cignature and a the girl group GOOD DAY under the name Viva.


2017: GOOD DAY, The Unit

On July 10, 2017, she was announced as a member of C9 Entertainment's newest girl group GOOD DAY. They debuted on August 30, 2017, with their first mini album All Day Good Day.

Later that year, she became a contestant on KBS 2TV's reality survival show The Unit. She was eliminated in episode 13 after ranking 29th place.

2019–2020: Cignature

November 13, 2019, Sunn was introduced as a member of C9 Entertainment's next girl group, Cignature. They are now managed by the subsidiary J9 Entertainment.

2021: Departure

Sunn had not posted on cignature's SNS since the 17th of March, 2021. Along with Ye Ah, she opened up her personal Instagram and they were the only members to not post about Semi's birthday. She does not follow cignature on her Instagram, unlike Ye Ah. It was confirmed on the 27th of April that Sunn and Ye Ah had left the group in preparation of a comeback.