She debuted with the group Puretty in August 2012 in Japan with plans to debut in South Korea as well, but the group disbanded in January 2014 without making their Korean debut.
In 2014, she was in the survival show Kara Project to become a member of Kara where she finished in second place. She was the leader of April but left in November 2015.
She then joined the Co-ed group ‘KARD’ in 2016, but they made their official debut on July 19, 2017 under under DSP Media. She represents the letter R and the BlackJokeR. Jun runs her own Youtube Channel called Minny J.