possible Pre-Tower of Babel language discovered

[True Federalist (진정한 연방 주의자)]

And don't tell me "it is obvious people all once spoke the same language", cause that would not have been obvious to someone writing around 1500BC.

Why wouldn't it have been obvious within the framework of Genesis?  How many languages did Adam need to talk to Eve with?  Any creation story that postulates a small number of initially created humans would imply the existence of a single human language at that point in time.