- 1992. 28th Official Exam of Technology from Korean government
- 1993. Deputy Director, Mechanical Engineer Dept. Space and Aviation Engineering Team. Ministry of Commerce.
- 1994. Examiner, Precision machinery Dept. the Korean Intellectual Property Office
- 2001. Senior Examiner, Conveying machinery dept. the Korean Intellectual Property Office
- 2001. 43rd Korean Bar Exam passed
- 2004. Chief Examiner, General Machinery dept. the Korean Intellectual Property Office
- 2004. 33rd Judicial Research and Training Institute, Supreme Court of the Republic of Korea
- 2004. Yoon & Yang, LLC Attorney
- 2004. Chief Patent Attorney, Wha Woo International Patent Law Firm
- 2007. Chief Patent Attorney, Chung Dam Patent Law Firm
- 2008. Partner Attorney, Chung Dam Law Firm
- 2013. Partner Attorney, Min & C
- 2019. Legal Council, the Korean Intellectual Property Office
- 2019. Legal Council, Korea Trade Commission