Marc Sangyoon Seo is the Managing Partner of ENDWEL Law Office, located in Yeouido, Seoul. A unique combination of technical expertise and legal acumen defines his practice—during his engineering studies at Seoul National University, he founded a venture company that provided him with extensive knowledge about IT business. This background enables him to advise Asian startups on Silicon Valley expansion and investment opportunities.

As a distinguished attorney specializing in comprehensive inheritance and family law matters, as well as international arbitration, Attorney Seo provides sophisticated legal guidance to clients navigating complex personal wealth and family matters. His areas of expertise include inheritance planning, international inheritance cases, inheritance and gift tax law, trust law, family law, and family litigation procedures.

Attorney Seo’s practice demonstrates particular proficiency in designing customized inheritance structures that optimize tax efficiency while respecting family dynamics. His knowledge of international inheritance regulations makes him a valuable resource for clients with cross-border assets and multinational family situations. 

As an authority on trust law and inheritance tax regulations, Attorney Seo helps clients develop strategic approaches to wealth preservation and transfer. His command of family law and family litigation procedures further enables him to address the full spectrum of legal challenges that families may encounter.

In the field of international arbitration, Attorney Seo represents clients in complex cross-border disputes, leveraging his understanding of multiple legal systems and international commercial law. His arbitration practice complements his wealth management expertise, particularly in cases involving international business interests and family wealth disputes that transcend national boundaries.

Currently engaged in writing a book that draws on his specialized knowledge, Attorney Seo continues to contribute to the professional discourse on inheritance planning, family wealth management, and international dispute resolution within the legal community.

BA, 2006. Seoul National University

Master of Law, 2009. Northwestern School of Law

JD, 2013. Aju University Law School

Completed Legal Studies, 2015. Georgetown Law School

Licensed to practice law in Korea (since 2013) and in the District of Columbia (since 2016)

Member of the International Bar Association

Member of the Seoul Bar Association

Member of the DC Bar Association