She performs under the stage name NS Yoon-G (NS윤지) and debuted in 2009 with the digital single "Head Hurts" under JTM Entertainment.

[3] Kim was born in Seoul, South Korea on September 6, 1988, and moved to the San Fernando Valley in California in the 4th grade.

She entered UCLA, majoring in Dance and Communication, but took a leave of absence after a year to pursue her career in entertainment in South Korea.

Countdown, MBC's Music Core and SBS' Inkigayo, alongside Jay Park who was occasionally replaced by Dalmatian's Simon.

[7] On November 23, 2018, it was announced that NS Yoon-G had changed her stage name to Kim Yoon-ji as she will be promoted as an actress.

[13] Kim was cast in Netflix's comic heist film Lift starring American comedian Kevin Hart.