The most important details of the incident with the South Korean exchange.
The exchange planned to distribute a bonus of about 2,000 KRW, but due to an error, the system displayed
$BTC instead of won.
Huge amounts of Bitcoin were reflected in users' internal balances — totaling around 620,000 BTC.
These were not withdrawn coins but balances within the exchange, but some users managed to sell.
On the platform itself, the BTC price temporarily dropped by −17%.
The exchange halted trading, froze the affected accounts, and returned about 99.7% of the funds.
There was no hacking — it was purely an