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Yonsei University confirmed on Oct. 22 that its portal service was hacked, leaking personal information of about 15,000 students, graduates, and staff. Dong-A Ilbo reports the unauthorized access occurred twice — on Oct. 20 at 7:41–7:43 p.m. and Oct. 21 at 10:04–10:11 a.m. — and that leaked data included student numbers, names, mobile phone numbers, emails, department names, and last login times and IP addresses. Yonhap and the Korea Times put the figure at about 10,000, while Maeil Business and Chosun Ilbo report 15,000. The university has requested a police investigation, according to Hankyung. Korean media note this follows a similar breach at Sogang University in August, where 180,000 records were leaked, raising concerns about repeated attacks on universities.