South Korea is warning of renewed voice phishing ahead of the Chuseok holiday, including letter-phishing schemes that use forged postal notices to direct victims to fake mail carriers and prosecutors. Victims may be pressured to install malicious apps, provide personal information or surrender cash, gift certificates and cryptocurrency. National Police Agency data showed voice-phishing damage during the month containing last year’s Chuseok reached 101.1 billion Korean won ($72 million), nearly double the 51.6 billion won recorded in September 2021, while average losses rose 78.9% to 51 million won per case. Separate police data showed Seoul voice-phishing losses increased 2.5-fold from 160.4 billion won in 2023 to 402.8 billion won in 2025. Authorities advise residents not to call numbers on suspicious notices, to verify deliveries through a post office’s main number and to report suspected fraud immediately.