"Who are you?" Johnny's pupil shrunk when he heard her words. He knows his universe is a low-level universe. So, it would be impossible to learn about Supreme Realm. But not only she knows that but also blocked the attack with no difficulty.
He has to admit this power wasn't equal to the complete strength of a Supreme otherwise this universe would turn to dust. That would be really devastating considering everyone he knows still lives in this universe.
But that doesn't mean anyone could withstand this power.
"My name is Alexa. You must be the son of the person who destroyed the channel between two universes, right?" Alexa didn't have proper knowledge about Fei. She only found their aura was very similar.
