His first leading role was as in 2006 television series "Princess Hours".Ju debuted as a model, in advertisements for clothing brands such as Calvin Klein, Levi's and Reebok.He was sentenced to six months of jail time, suspended for one year, 120 hours of community service, and a fine of ₩360,000.On February 2, 2010, Ju enlisted in the Republic of Korea Army to serve his mandatory military service. On May 9, 2014, both Joo Ji Hoon's and singer Ga In's agency both confirmed that they are dating.
When I was a senior in high school, an agency contacted me after seeing my picture at a photography studio." She later graduated with a degree in Bachelor of Film and Television (BFTV) in Dankook University.
Jung made her acting debut in the coming-of-age drama, Reply 1997 in 2012. The song charted on no.1 on the Gaon charts and also received two music show wins.
She has since had roles in That Winter, the Wind Blows (2013), Trot Lovers (2014) Cheer Up! Jung also took part in the composing and lyrics in the mini-album. Jung made her acting debut in Reply 1997, a 1990s nostalgic dramedy which became one of the highest-rated Korean series on cable television.
He was arrested along with 15 people and an actress identified as Yoon on suspicion of supplying ecstasy.
On June 23, 2009, Ju pleaded guilty in court to drug use of ecstasy and ketamine.