Isaac withstood the enemy attacks for two days in the area around the dungeon. During that time, the hunters were constantly dispatched to suppress the dungeon break.
A total of 6000 hunters were sent from China. None of them were from the major guilds, so they didn't do anything to defend themselves. Russia sent 6000 hunters, a combination of 3000 HFD troops and 3000 hunters from government-affiliated guilds. Meanwhile, North Korea as a whole was only able to send 1000 hunters.
South Korea had offered to help North Korea. Unfortunately, Kim Zhong-Euh, the current President of North Korea, refused their help. As a result, 4000 monsters managed to break through the defenses and invaded the human settlements. At least two port cities, Sonbong and Rason, had been taken over by the monsters.
This selfish decision resulted in the loss of 10,000 lives. Three-quarters of it were the civilians.