Upbit Halts Withdrawals After ₩44.5 Billion in Solana Tokens Stolen

The provided sources collectively offer strong support for the statement. The most authoritative source confirms the two foundational claims: that Upbit suffered a major hack and subsequently halted withdrawals. A second, highly relevant source then provides the crucial causal link, reporting on the immediate market effect and connecting the hack and withdrawal halt to price trends in altcoins. This phenomenon, where trapped funds on an exchange lead to a localized rally in other available assets, is a known market dynamic. While no source explicitly uses the phrase 'Korean retail investors,' Upbit is a major South Korean exchange, making it a very strong and logical inference that its user base, who would be driving this localized rally, are predominantly Korean investors. The remaining sources corroborate the initial hack but do not focus on the market reaction, and importantly, they do not contradict the claims. The consistency between the most authoritative and relevant sources, with no conflicting evidence, makes the statement highly likely to be true.