BTCC, formerly known as BTC China, was launched in 2011 by Yang Linke and Lee came aboard as CEO and co-founder in 2013. As CEO, Lee helped the exchange secure a $5 million Series A funding round in 2013, making it one of the first to do so. At the time BTCC boasted the highest trading volume worldwide, ahead of other major exchanges including Mt. Gox and Bitstamp.
In 2018, BTCC was acquired by a Hong Kong-based blockchain investment fund, the name of which was not disclosed at the time. Lee left BTCC in 2018 and founded cryptocurrency wallet startup Ballet, which launched in 2019. The company produces hardware wallets that support multiple cryptocurrencies and tokens, and are designed to be accessible to industry newcomers