Lee Seung-gun, D.D.S., is a South Korean businessman, the self-made billionaire Founder and CEO of Viva Republica (known for Toss), a leading fintech company and South Korea's first unicorn startup. His career is rooted in dentistry, military service, and a profound commitment to disrupting traditional finance.

Lee holds a Doctor of Dental Surgery (D.D.S.) degree from Seoul National University (SNU), one of South Korea's most prestigious universities. He served in the South Korean Navy as a dentist for three years. His entrepreneurial journey began after he became frustrated with the inefficiencies of traditional banking—recognizing the immense potential of mobile technology to simplify financial services.

• Viva Republica / Toss (Founder & CEO): The core private asset, a dominant fintech company operating the Toss super app (offering payments, stock trading, and banking services to over 20 million users).
• Fintech Pioneer: He became a serial entrepreneur after leaving dentistry, with Toss becoming South Korea's first unicorn startup.
• Academic Background: He holds a D.D.S. degree from Seoul National University and served as a dentist in the Navy.
• Investment Strategy: His philosophy centers on simplicity, security, and mobile-first integration (creating the 'Super App' model).

Dr. Lee Seung-gun's strategic genius was his commitment to solving friction points in finance. He founded Viva Republica in 2013 after 10 failed startup ideas. The Toss app, launched in 2015, revolutionized mobile banking by introducing simple money transfers and later expanded into a 'super app' offering P2P lending, stock trading (Toss Securities), and mobile banking (Toss Bank).

His structural contribution is immense: pioneering the fintech revolution and successfully disrupting the traditional South Korean banking establishment. His commitment to financial inclusion and ease of use has secured Toss a massive user base (over 20 million users). His wealth is tied to the colossal valuation of Viva Republica, cementing his status as a self-made tech visionary.

Dr. Lee Seung-gun's social impact is structural, stemming from Toss's role in driving digital financial inclusion and simplifying financial services for millions of South Koreans. His company provides thousands of stable jobs in the technology and finance sectors. His career is a testament to the profitability of disciplined fintech entrepreneurship and solving structural inefficiencies in traditional banking.

His personal philanthropy supports various community and educational initiatives, often tied to technology and SNU (his alma mater).

Lee Seung-gun maintains the professional, high-energy style of a technology executive. His attire is consistently formal and high-quality, favoring tailored suits. His aesthetic reflects serious authority and stability, typical of a pioneer in the specialized fintech sector.

Residing in Seoul, South Korea, his luxury is the immense security and financial reward derived from his multi-billion dollar fortune. His life is dedicated to fintech innovation, strategic management, and the long-term, stable growth of the Toss super app empire.