• Auditor (Financial Audit) Audit Division, Samjong KPMG
• Finance Officer (Accounting Service), Republic of Korea Army
• Auditor, Audit Division, Samil PwC
• Accounting Team Specialist, Great Imagination Corp.
• Auditor, Busan Branch, Samduk Accounting Corporation
• Auditor, Busan Branch, Hanwool Accounting Corporation
• Auditor, Busan Branch, Hyundai Accounting Corporation