The King did, in fact, take Ye Qingtang's advice and rescinded his chilling order to slaughter everyone.
Now, all the kingdoms on this mainland were terrified of Ye Qingtang. The moment they saw Ye Qingtang on the battlefield, they fled as swiftly as possible. Some of them simply raised the white flag in surrender.
Ye Qingtang also took the opportunity to suggest that to avoid further warfare, the King should accept any Kingdom that voluntarily surrendered and submitted to the Supreme League Kingdom. All they had to do was disarm and remove their royal family. Then, the Supreme League Kingdom could take over straight away without needing to fight any further.