Lee Na-gyung, known mononymously as Nagyung, is a South Korean singer, songwriter and actress under ASND. She is a member of the girl group fromis_9, formed through the reality survival show Idol School (2017). Lee Na-gyung, known mononymously as Nagyung, is a South Korean singer, songwriter and actress under ASND. She is a member of the girl group fromis_9, formed through the reality survival show Idol School (2017).