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Changhyun Cho
Changhyun Cho (also transliterated Cho Chang-hyun) is the chief executive officer of 1Self.World Inc., a Seoul-based blockchain technology startup he has led since May 2023.[1][2] His career spans management consulting, internet and mobile marketing, and the blockchain industry, with prior leadership roles at the digital marketing group FSN and its regional arm FSN ASIA, and a partnership at the consulting firm A.T. Kearney.[1]
Early Life and Education
Cho holds a Bachelor of Arts in Economics from Seoul National University, which he attended between 1995 and 2001.[1][2] He is based in Seoul, South Korea.[2]
Early Career
Cho began his career in the entertainment and investment sectors before moving into consulting. From February 2002 to May 2004 he was a marketing manager at Noon Entertainment Co., Ltd. in Seoul, where he reports developing film synopses and scripts, managing production, and securing seed funding from investors, which served as the basis for later work with blockchain.[1] He then joined Withus Investment Co., Ltd. as an investment manager from May 2004 to May 2006, initiating equity-based investments in content companies and executing investments in more than ten film projects.[1]
From May 2006 to October 2009 he was an associate manager at Nemo Partners SCG, a management consulting firm in the Gangnam district of Seoul, where he reports being recognized internally as an expert in mergers and acquisitions and conducting due diligence and market-entry engagements.[1][2] He subsequently spent nearly six years at A.T. Kearney (Kearney), also in Gangnam-gu, as a partner and leader of the firm's Communications, Media and Technology (CMT) practice from November 2009 to August 2015.[1] In that role he reports more than twenty due diligence and post-merger integration engagements and more than twenty new-business and market-entry strategy projects across telecommunications, media, technology, semiconductors, automotive, and healthcare, working with private equity funds and multinational companies.[1]
FSN and FSN ASIA
Between 2015 and 2022 Cho held concurrent senior roles at FSN, a KOSDAQ-listed advertising technology group, and its regional subsidiary FSN ASIA. From September 2015 to November 2022 he served as a board member and CEO of FSN's Global & Innovative Group, based in Gangnam-gu, Seoul.[1] He reports leading FSN's initial public offering on the Korean stock market, describing the company as the first ad-tech company listed on KOSDAQ, and overseeing its principal business CAULY, which he characterizes as Korea's leading mobile advertising network.[1]
From September 2015 to December 2022 he was CEO of FSN ASIA, based in Singapore, a digital marketing and blockchain company operating across Korea, China, Taiwan, Singapore, Thailand, Indonesia, Vietnam, and Laos.[1][2] He reports leading the group's overseas business across those markets, developing advertising products including a retargeting product and a lockscreen advertising platform called ADPOCKET, and acquiring or building more than ten companies across Korea, China, and Southeast Asia while managing M&A and legal and financial affairs.[1] He states that FSN ASIA's Vietnamese subsidiary, Clever Group, is listed on the Ho Chi Minh Stock Exchange.[1]
During his time at FSN ASIA, Cho also directed the group's early blockchain and cryptocurrency ventures. He reports managing the SIX Network initial coin offering (ICO) and launching a digital intellectual-property management service called ECHO, which he says stored more than two million digital contents on a blockchain network.[1] He further states that he helped establish the decentralized finance (DeFi) platform Definix, which he describes as an official DeFi partner of the Klaytn blockchain.[1]
1Self.World
Cho founded and has led 1Self.World Inc. (also styled 1SW, and rendered in English coverage as OneSelf.World) since May 2023.[1][3] The company is a Web3 blockchain technology startup headquartered in South Korea and founded in 2023, and it positions itself as a bridge between Web 3.0 and Web 2.0.[1] Its stated purpose is to let individuals own the data that platforms currently monopolize, so that users and advertisers can connect directly and inefficiencies in the advertising and marketing market are reduced; the company says it uses Web 3.0 technology and Soulbound Tokens (SBTs) — non-transferable, wallet-bound tokens used to represent identity and attributes — to do so.[3] The firm reports a size of one to ten employees.[3]
MyB and W3ID
The company's core product is MyB, a digital asset wallet that Cho describes as a "Blockchain Wallet-Based Marketing Platform." He states MyB reached one million downloads within its first year of launch.[1] The wallet is paired with MyB AdChain, an artificial-intelligence and blockchain reward advertising network.[1] Cho has summarized the company's product philosophy with the phrase "지갑을 만들기보다, 먼저 쓰이게 하자" ("rather than building a wallet, first make it used"), and describes 1Self.World as offering "a Web3 service that users actually use," attributing user growth to what he calls a "blockchain-hidden" approach that keeps the underlying technology invisible to end users.[1]
Underlying the platform is a patented technology the company calls Web 3.0 Identity (W3ID). Cho states that 1Self.World registered a patent for W3ID and presents it as a practical alternative to Know Your Wallet (KYW), the practice of identifying and understanding the entity behind a blockchain wallet.[1] Reporting on the company describes W3ID as an on-chain database technology that identifies and analyzes users by combining digital asset wallet addresses with SBT attribute data, and states that W3ID has completed domestic patent registration in Korea and passed U.S. patent examination.[4]
Funding
1Self.World reports $2.4 million in total funding across two funding rounds.[1] In its Pre-Series A round the company secured approximately USD 1.1 million (KRW 1.5 billion) from Crit Ventures. Cho said the capital would enhance the platform's machine-learning-based recommendation engine, further develop AI-driven quiz events for MyB, and support expansion into the ad network business so that the company's identifier technology could be used across other mobile platforms.[5] In later funding communications Cho described the platform as combining AI with data-reliability technology, stating: "Our innovative advertising platform that combines AI with data reliability technologies can become a new standard for the global mobile ecosystem. With this funding, we will accelerate global expansion and business model diversification."[6]
Growth and Operational Milestones
Across 2025 and 2026 Cho has reported a series of operational figures for 1Self.World. In posts dated September 2025 he stated the company had "already 1,000,000 wallets and over 40 million SBTs" issued.[1] A February 2026 post claimed 1.45 million users and revenue growth of fifteen times over one year.[1] For the first half of 2026 he reported 70 million SBTs issued, six million monthly active users (MAU), and monthly revenue of one billion Korean won.[1]
Reporting on the company's first-half 2026 performance stated that its sales tripled year-on-year and that average monthly sales in the second quarter exceeded one billion won, with the company projecting 20 billion won in annual sales if the trend continued. That coverage attributed the growth to the MyB wallet and MyB Ad Chain, which it said together had six million wallet users and 77 million cumulative SBTs, and reported that the company had been selected over six competing ad-tech firms by a leading Korean internet bank and had confirmed a linkage with a global K-pop fandom platform.[4] Cho framed the results as evidence of the wallet-as-data-platform model, stating: "The average monthly sales of KRW 1 billion in the second quarter is an indicator that wallet-based user data is leading to actual sales," and "We will make the direction of wallet as a platform where data is generated, not a simple payment method, into a real business."[4]
Partnerships and New Initiatives
1Self.World has pursued blockchain infrastructure and financial partnerships alongside its advertising business. In September 2025 Cho reported that the company joined the XPLA mainnet as a node validator, a role in which an operator helps confirm transactions and secure the blockchain network.[1] In December 2025 he reported that the company signed a memorandum of understanding with the payments firm KSNet for a pilot combining a Korean-won stablecoin with payments and rewards.[1] Cho has also stated that 1Self.World is developing a Security Token Offering (STO) business model in cooperation with large financial institutions and customer platforms.[1]
The company has strengthened its leadership to support these initiatives. In May 2026 Cho announced that Kang Young-hoon, former CEO of The Sandbox Korea, had joined 1Self.World to work on a stablecoin service.[1] Reporting on the company additionally identified the recruitment of directors Park Tae-gyu and Kang Young-hoon, who previously led the DeFi platform KlaySwap (Ozis) and The Sandbox Korea respectively, and said the company intended to specify how W3ID would apply to the financial sector and to engage in discussions on wallet sovereignty and KYW, including through a private policy forum described as the "On-chain Data Forum."[4] Cho has also publicly commented on Korean digital-asset regulation, stating that "디지털자산기본법으로 새로운 생태계 열릴 것" ("a new ecosystem will open through the Basic Digital Asset Act").[1]
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Edited By
On August 28, 2026. 12:18 UTC
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