Taejun is the Founder and CEO of Gojo & Company, a start-up providing tech-enabled microfinance services through its operating companies in developing nations. Founded in 2014, Gojo operates in 5 countries, serving 1.5 million customers with 9,000 group employees as of 2022. Having completed its Series E financing round of $100 million recently, it is the fastest-growing microfinance group in the sector's history, projecting to do an IPO in a few years.

Having graduated from Korea University and Waseda Graduate School of Finance, Taejun worked at Morgan Stanley and Unison Capital and engaged in private equity investments for eight years. While working in the industry, he founded an NGO named Living in Peace in 2007. Living in Peace made the first microfinance investment fund in Japan's investment history in 2009 and has supported children in Japan living under the alternative care system. In 2021, Taejun co-founded Japan Office for Standards on Children's Services, whose job is to publish inspection reports on local authority children's Services ("Jido-sodanjo").

Taejun has authored nine books about finance, child welfare, and innovation. He is the finisher of a 1648 km ultra-marathon and holds a Karate black belt and 6 Dan of Go (game). He loves playing drums and taking street photos of people in the world.