Daishin Securities detected signs of unauthorized access last week and discovered that personal information of 38,490 customers, including names, email addresses and mobile phone numbers, was leaked

From the articleBithumb Investigates Extent of Data Leak After Internal HackAlso in Bithumb hacked through employee system as South Korean financial firms face cyberattacks, Bithumb Says Hackers Accessed Internal System, Leaking Personal Data - Decrypt, Three South Korean financial firms including Bithumb report data breaches, Yonhap says | Reuters, Bithumb among three South Korean financial firms reporting data breaches