Kim Myung-ji debuted as a member of Tiny-G in 2012. She served as the group’s main rapper, lead dancer, and vocalist. They released their self-titled debut single in August 2012. The group unofficially disbanded in 2015.

Kim Myung-ji participated in Mnet’s reality girl group survival show Idol School in 2017, where she ranked 27th overall. In 2019, she appeared in the OCN drama Class of Lies. She then played a guest role in the 2020 tvN romantic comedy True Beauty. In 2021, she starred in the web drama Fly, Again. That same year, she landed her first big screen appearance in the family mystery film The Girl in a Tiny Room. In 2022, she was cast in a supporting role in JTBC’s The Empire of Law.