Meet the geeks of Teheran-ro - South Korea's own Silicon Valley.
Mr Kim Kang Hak, 33, used to analyse big data for a living, while Mr Regan Hwang's job was to "evangelise" technology.
Both were working for top players in the IT industry - the former at South Korean Web portal Daum and the latter at US tech giant Microsoft. But they have chosen to join the rising ranks of young, tech-savvy talents who ditch safe jobs in big companies to strike out on their own.
