South Korean online bookstore's system goes down due to ransomware attack...Service not restored for two consecutive days

South Korea's largest online bookstore, YES24, was hacked with ransomware, leaving its website and app inaccessible for two consecutive days.
The system has been paralyzed since the problem occurred at around 4 a.m. on the 9th.
According to documents submitted to Rep. Choi Soo-jin (People Power Party), Yes24 reported the hacking incident to KISA the previous afternoon. The company's website said, "Due to a system failure, access to the website was suspended.
The notice stated, "Connection, product shipments, and customer center access are currently unavailable," and also stated that some orders placed on June 8th will be canceled due to the inability to ship the product.
Due to the system failure, the ticket sales platform operated by Yes24 is also unavailable, causing problems with event reservations and applications.
Producer BI's fan club advance reservations and the application for the offline fans autographing session of the popular group ENHYPEN have been postponed or canceled.
The government is now scrambling to change the ticket sales platform from Yes24 to another platform. According to Choi's office, the hackers encrypted member information and other data, and it will cost them money to decrypt it.
However, Yes24 has not agreed to provide technical support to KISA regarding cyber attacks, and KISA is facing restrictions on accessing information for the accident investigation.
It seems there is.