About usWe envision a world of mainstream blockchain adoption.

Team Value

We believe in people, most importantly, we value our people. We know people build vision, create reality, assimilate teamwork that lead to results. We believe in empowering others by listening, observing, delegating and responding. By helping others, we help ourselves. Below are SIGMACHAIN’s core values that represent our leadership, future vision and company spirit:

  • Grow our business in a way that improves other businesses.
  • Be open, accessible, honest and handy to others.
  • Demonstrate innovation through experimentation.
  • Embrace constant desire for improvement.
  • Service always matters.
  • Focus on building value, be entrepreneurial.
  • Be authentic.


Create a decentralized
Internet that is fast, friendly
and safe for everyone.

Jinyoung Kwak

Jinyoung Kwak CEO / CTO

Developed ‘Cyworld’ as a software engineer at Max Automation with a Master’s degree in Computer Science from Griffith University.
After that as a DBA, served as the CTO of ‘Saycupid’, then became an affiliate professor in Department of Game Engineering at Korea Polytechnic University. Evaluated as an Expert in SNS information technology with strengths in the field of coordinating Solution (DB) Design & Analysis and Consulting.
Since 2015, Developed SNS service related technologies based on distributed network infrastructure,Currently, as the founder and CEO of SIGMACHAIN, is in charge of services of SIGMACHAIN.
Received the Blockchain Innovation Award at the Global Economic Cultural Development Award 2018.

Kwangsik Choi

Kwangsik ChoiExecutive Advisor

As a Ph.D. in Business Administration from Yeungnam University Graduate School, was awarded the ‘The 2nd Korea Trusted Best CEO Award for Public Administration in 2008’ and ‘The 1st Korea CEO Leadership Award for Transparent Management in 2011’.
After serving as the CFO of the ‘SK Group’, served as the CEO of the ‘Daehan Oil Pipeline Corporation’ in from 2006 to 2010.
After that, consecutively served as the CEO of the ‘City Airport, Logis & Travel, Korea’, the independent director of the ‘Korea Gas Corporation’, the chairman of the board of the ‘Korea Gas Corporation’, and the audit committee of the ‘Korea Gas Corporation’.

Dennis Oh

Dennis OhCOO (Chief operation officer)

Having a bachelor's, master's and doctorate degree in Industrial Engineering from KAIST, he has a history of conducting dozens of successful mergers and acquisitions and have consulted more than 2000 enterprises. He was the representative director of Saving Bank and Nexus Investment Company and was the CFO of Modia and Netmarble as he helped them to be listed on KOSDAQ. He has the planning ability to develop business models and can help towards its horizontal and vertical expansion. Within SIGMACHAIN, he has developed various blockchain business models and coin ecosystems.

Yongjun Hyung

Jangjun YunCRO (Chief revenue officer)

Jangjun Yun is the SIGMACHAIN CMO, CEO of Doobe Co. Ltd., and Technical Adviser for Korea Software Industry Association. He was part of Shinhan Bank’s smart task force, where he gained extensive experience in building personal information management systems based on the blockchain. In addition, he has built a video evidence analysis system based on AI for the Police Agency. Jangjun was part of the team that participated in making of Big Data POC production center while working along with Google and LG Display. Moreover, he has built the Hyundai and Kia Motors g-CRM / GVOCM.

Dongyoon Shin

Dongyoon ShinCSO (Chief strategy officer)

As an expert in business model commercialization, marketing and consulting, he has conducted marketing and web consulting services for 30 major companies specialized in internet such as Joins.com, Naver, Empas, etc. He also worked as a representative expert in tnternet field at Foxnet, founded online vaccine company Everyzone and led the company to the top of the industry. Also co-founded Kuku Communications Co., Ltd., secured the largest number of customers in the shortest time through the automatic address book “KukuBox” service. He served as the Chief Marketer at NHN Co., Ltd. He is currently serving as a marketing, distribution advisory board of the Rural Development Administration and also an advisory board member of the Bucheon Smart City Challenge Project.

Cho Jaehyeon

Jaehyeon ChoCMO (Chief marketing officer)

He served as a director and general manager of Asia for a Hollywood movie studio and content production company in the United States and performed numerous Global Projects. Currently, he is working as a director and general manager of Asia for a Global Metaverse platform ‘Another Universe’.
Since 2017 he successfully incubated and launched numerous projects based on Blockchain technology. (Blockchain Messenger, FX Trading platform IDUS, World’s First DeFi ETF Project ‘BLK’ and so on)

Cho Jaehyeon

Jeongseok WangCISO (Chief information security officer)

Currently, he is the Korea branch manager of ‘Stellar Cyber’, an AI/Machine learning based integrated security analysis platform developer and CEO of ‘Expert System’.After being the head of the ‘Pumpkin Networks’ development team, served as a responsible security consultant at ‘Lotte Data Communication’, where he oversaw security consulting for affiliates and the establishment of a national information network malicious code management system. He served as the Korea branch manager of ‘Aerohive Networks’, an AI-based distributed processing wireless AP manufacturer.

Michael kim

Michael kimCIO

He is a Ph.D in business administration at AIU in the United States and a former CTO of H2 Energy.As an ESG management consulting expert, he created and operated an ESG Fund of $50 million in over 30 countries around the world.Starting with blockchain related management consulting activities at id4SOFT, he started professional blockchain consulting, participated in the design of embedded hardware for distributed network based technology, and genome based distributed identity authentication DID and Metaverse expert, currently working as a CIO of Sigma Chain.In addition, he is active in cooperation with UNICEF & international relief organizations, and in donation and volunteer work.

Michael kim

Jinyeong YangLegal Advisor

Attorney Jinyoung Yang, who is currently active as a Legal Advisor for Sigma Chain,Graduated from Korea University Law School, Korea University Graduate School (Master of Laws),Graduated from Hanyang University Graduate School of Management Consulting (Ph.D. in Business Administration)Passed the 38th Judicial Examination.Served as former) Saenuri Party Vice Chairman of Gyeonggi Province,Board Director of Korea-China Cultural Ansan Forum and President of Onnuri Personality Psychological Counseling Association,Currently active as the Senior Staff Attorney at a Law Firm Onnuri.Established Korea's First Law Cafe, leads a drastic change in legal services by providing all facilities free use of legal consultations as well as self-ligitagation in a pleasant cafe atmosphere.

GunSoo Yoon

GunSoo YoonSPD (Strategic Planning Director)

He is currently the CEO of Sigma NFT. He served as CIO of Yello Mobile 020 DALI Communications, Director of Coreana Cosmetics Orcia, and Education Center of the Financial Investment Association. He was a representative lecturer at Hackers Finance Academy, and also lectured at the Korea Productivity Center for creating the next generation financier. He was a professor at Korea Productivity Center who promoted College Students Employment Program. He won the Ministry of Culture, Sports and Tourism 3.0 Cultural Data Utilization Contest. Also served as an organizing member of the Korea Beauty Alliance Association. He wrote Explanation of Laws and Regulations related to the Capital Markets Act, and textbooks (about 60 books) of Financial Investment Association.

Ethan Jung

Ethan JungCSO (Chief Sustainability Officer)

Currently, he is Chief Strategy Officer of SIGMACHAIN and CEO of ESG Insights Group. He majored in industrial engineering and computer science and has experience in various industries such as manufacturing, public services, telecommunications, and finance.After graduated from KAIST, he worked as a project PM and technical director at domestic and foreign companies such as KT(KTF), Samsung Electronics Future Strategy office, SK E&C, Philip Morris International. He focused on horizontal and vertical expansion based on the core value chain of business model. Also has the planning power to develop a business model and grow the developed model.