Well, thats a difficult question, because are you specific to just humans or animals? Plus the right answer is based on what you believe. Like if you believe God created everything, then animals were the first to speak, and then humans, well it did not specify in the Bible what they spoke. If you believe in evolution, animals were also the first to speak in their own language, probably through noises and body language
-Just a note, the korean is upside down.
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The first character. geul, means orange, or tangerine.
The other two, euisang, mean clothes.
So put together, it basically means like 'tangerine clothes', or maybe 'orange costume'. With no other context I can't really tell what it exactly means.
I hope this helped anyway. ^^
