South Korean crypto exchange Upbit experienced a 27.5% increase in trading volume, reaching over $2 billion, shortly after a $36 million hack. This surge is linked to 'fence pumping,' a local trading phenomenon where activity spikes due to suspended withdrawals. Upbit reportedly generated over $340,650 in commission fees in one day. However, by December 2, trading volume had decreased to $1.4 billion. Analysts caution that fence pumping may involve speculative price manipulation.