Whats Aegyo tone? And please give me insights on Korea!

So I'll be moving to South Korea soon and wanted to learn about Korea..my friend said people there talk in cute aegyo tone...so I searched it on Korea and found this ( link ) anyways...like...is it really that bad? my friend was joking with me and told me to learn Korean and do that tone..but...it does sound gross and girlie like in the vid..anyways can someone give me insights on Korean culture too? THANKS
Whats Aegyo tone? And please give me insights on Korea!
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