Jung  made his acting debut in 2004 with the mobile drama Five Stars. He first gained notice in 2008 when he took two contrasting roles — as a crazy young executive in La Dolce Vita and a calm and patient boyfriend who suffers for love in Women of the Sun.

Jung’s popularity grew with the 2009 melodramas Again, My Love, and Loving You a Thousand Times; the latter became the first Korean drama exported to Bulgaria. In 2010 to 2011, Jung began to get cast in leading roles, which included a judo athlete training for the Olympics in Dr. Champ, a cop working in the violent crimes division in forensic medical series Sign, and a man who falls for a maid in Romance Town.

Jung received the best reviews of his career yet for his portrayal of a corporate spy in 2012’s History of a Salaryman. This was followed by the family drama Wonderful Mama (2013), the time travel thriller God’s Gift – 14 Days (2014), and the makeover romantic comedy Birth of a Beauty (2014).