Invincible Little Hunjun

When Zhao Qi traveled through Dazhao, he was a minor at the beginning and was still a puppet emperor who had just ascended the throne. There is a Holy Queen regent inside, and an enemy army is pressing down on the territory outside. The useless system told him that in three months the imperial city would be destroyed and perished in a sea of fire. What should he do? In this case, you have to carry the knife yourself. However, all he killed were cancerous tumors; Why did everyone start calling him Hunjun?