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Yonsei University's portal service was hacked, leaking personal information of about 10,000 students and graduates. The university confirmed unauthorized external access and reported two breaches: on Oct. 20 from 7:41-7:43 p.m. and Oct. 21 from 10:04-10:11 a.m. It has requested a police investigation. Korean media outlets are reporting this as a major security incident, emphasizing the scale of the leak and the university's notification to affected members via text message on Oct. 22.