Shinhan Bank is facing a Financial Supervisory Service investigation after hackers leaked personal and loan-related information belonging to about 25,000 customers. The exposed data included names, phone numbers, annual income and loan borrowing details; earlier reporting also identified approved loan limits, resident registration numbers for 66 customers and 97 connected information records. The latest account said the leak occurred Wednesday, while earlier details placed unauthorized access between the 29th of the previous month and the early hours of the 30th through an authentication-bypassing method in a simplified web lookup service. Shinhan said login-authenticated banking services were not hacked, blocked external IP addresses, suspended affected services, formed a response team and completed safety measures. Sources suspected overseas-based hackers used advanced AI tools, while experts said the bank may have been caught in random AI-powered attacks against vulnerable online platforms rather than specifically targeted. The FSS began an on-site inspection expected to take months. Shinhan said it would compensate confirmed losses, while President Chung Sang-hyuk apologized and pledged to strengthen information-protection systems, security processes and employee training. The breach has also raised questions about Jung’s bid for a third consecutive term, with any regulatory finding of internal-control failures potentially affecting the year-end leadership selection.