They were stunned after the three dragon kings learned the truth behind their emperor's anger. It's been a while since the Immortal Sun Emperor acted with such a human emotion after all this time. Actually, before he sat on his throne's empire and became the Immortal Sun Emperor, he was no different than he is right now. However, he simply has too many enemies, and they were all killed because of their jealousy towards his talent. In the end, he can only create an empire in the name of his deceased family.