Yun Sup was admitted to the Ohio Bar in 2006. He earned a Bachelor of Science in Mathematics from Korea University in 1996. He also earned a Master of Business Administration from California University, San Bernardino in 2001. He earned a Juris Doctorate from Cleveland-Marshall College of Law, Cleveland State University in 2004. He is currently working on a Bachelor of Science in Electrical Engineering at Cleveland State.

While at Cleveland-Marshall, he externed with Judge Sean Gallagher in the Eight District Court of Appeals. He worked with American Express Financial Advisors Inc. Ontario, California as an intern.

He was a recipient of the Korean Honor Scholarship from Embassy of the Republic of Korea in United States of America. He received an International Student Merit Scholarship and 27th Annual Recognition Awards for Dedicated Service at California State University, San Bernardino.

Yun Sup is a member of the American Bar Association.