YOON&YANG

• Defense Industry · Public Contract
• Litigation ∙ Arbitration
• Government, National Assembly & Media Relations
• Bio Health Center
• Aerospace

• 2018-present Yoon & Yang LLC
• 2026-present Outside Legal Counsel, Korea Ocean Business Corporation
• 2025-present Legal Advisor, Ministry of Finance and Economy
• 2025-present Legal Advisor, Korean Sport & Olympic Committee
• 2018-present Member, Korea Public Administration Case Study Association
• 2021-23 Legal Advisor, Korea Western Power Co.,Ltd.
• 2021-23 Legal Advisor, SR Co., Ltd.
• 2018 Deputy Director, International Contract Division, Defense Acquisition Program Administration
• 2016-18 Deputy Director, Legal Affairs and Litigation Office, Defense Acquisition Program Administration
• 2015-16 Public-Service Advocate, Seoul Immigration Office
• 2014-15 Public-Service Advocate, Changwon District Public Prosecutors’ Office
• 2013-14 Public-Service Advocate, Ministry of Education

• 2025 Korea Productivity Center (Completed the Advanced Executive Course in Defense Industry)
• 2024 Moneytoday Policy Academy Course
• 2017 Korea University Graduate School (LL.D. course completion)
• 2013 Pusan National University Law School (J.D.)
• 2009 Korea University (Politics, Economics and Law course)
• 2009 Korea University (B.A. in Political Science and International Relations)

[Key Success Cases]

• Represented Hanwha Aerospace in preemptive defense against the Defense Acquisition Program Administration (DAPA)'s proposed sanctions for disqualification — sanctions waived
• Achieved a full victory for Hyundai Rotem in a damages lawsuit related to alleged violations of the Win-Win Cooperation Act
• Successfully obtained injunctions on behalf of STX Engine to block the extension of disqualification sanctions across multiple agencies, including the Public Procurement Service (PPS), DAPA, Ministry of Oceans and Fisheries, Agency for Defense Development (ADD), and Defense Agency for Technology and Quality (DTaQ)
• Represented SK Broadband in preemptive defense against PPS’s sanctions — sanctions waived
• Won a civil lawsuit for Hanwha Aerospace involving a DAPA defect warranty claim of KRW 37.3 billion — achieved a 96% success rate
• Represented Hanwha Life in an administrative litigation challenging sanctions under the Insurance Business Act — prevailed on all key issues
• Represented Hanwha Defense (former) in pre-litigation defense and civil litigation against DAPA’s liquidated damages claim — partial reduction achieved pre-litigation, full exemption granted at litigation stage
• Represented listed AI company Lunit in preemptive defense against sanctions by the Military Manpower Administration — sanctions waived
• Represented RH Focus in pre-sanction proceedings by DAPA — successfully reduced penalty to a fine
• Represented the GTX-A line project operator in an administrative appeal against a local government’s denial of road and green space occupation permits — appeal upheld, mandatory implementation ordered
• Represented KB Real Estate Trust in a landmark administrative litigation regarding the disposition of trust-held real estate within an industrial complex — obtained a favorable ruling
• Represented HiteJinro in a lawsuit challenging corrective orders by food and drug authorities related to alleged exaggerated advertising — won the case
• Represented Sambu Construction in an administrative lawsuit (party litigation) defending against a local government’s claim for compliance with attached conditions — victory achieved
• Represented a Korean local public enterprise in an ICC arbitration related to a joint venture shareholder agreement with a Singaporean company — successful outcome (handled public law matters)
• Represented Mapo Facilities Management Corporation in comprehensive legal actions against unauthorized occupants of public property — won eviction suit, preliminary injunction to suspend bidding, and suit for confirmation of illegal inaction
• Represented clients in investigations involving violations of the Nationality Act, Immigration Act, and Military Service Act related to dual citizenship, securing a suspension of prosecution
• Represented a Korean botulinum toxin manufacturer in pre-litigation defense and administrative litigation concerning product approval revocation — some revocation grounds excluded pre-litigation; obtained injunction and won merits case
• Represented a Korean Army general in a lawsuit to cancel a dismissal order issued by the Army Chief of Staff and a private university in a wrongful dismissal lawsuit — both cases won

[Key Advisory Achievements]

• Advised the Board of Audit and Inspection, central administrative agencies, and local governments on regulatory policies, administrative sanctions, audits, and investigations
• Advised on bidding announcements and contracting matters for public procurement projects commissioned by the Public Procurement Service, local governments, and public institutions
• Advised multiple Korean defense contractors on defense industry regulations, including project execution, contracting, and cost systems
• Advised various foreign defense companies on arms procurement negotiations, contracts, and compliance with the Korean defense regulatory framework
• Provided legal consulting to the Saudi Arabian government regarding Korea’s defense industry regulatory framework
• Advised corporations on agreements and sanctions (restrictions on participation) related to government-funded R&D projects
• Provided legal consulting on dual citizenship, military service, and visa issuance matters
• Delivered comprehensive advisory services to central administrative agencies, local governments, and public institutions regarding their operations
• Provided general legal advisory services to IT startups
• Advised private educational institutions on matters related to their management and operations
• Advised non-profit organizations on matters related to their management and operations

• Ministerial Commendation, Defense Acquisition Defense Acquisition Program Administration (contribution to handling litigation affairs) (2017)