Jonghun Jeong gained various experience at a labor law firm, such as experience in advising on corporate personnel management, handling adjudication cases before the Labor Relations Commission and petition cases before the Ministry of Employment and Labor. At the labor law firm, he was also engaged in numerous cases, including a case of improving work hour system, an investigation of workplace sexual harassment and harassment, and advice on industrial safety audit. Based on such hands-on experience, he is currently at Bae, Kim & Lee LLC and is in charge of advising companies on labor management and on responding to labor-related cases and doing other consulting work.