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I'm a Busan(Gyung-sang province) dialect speaker.
I can't say I know exactly how many dialects are in Korean.
I would like to say the diarects can be roughly divided into 5 dialects.
Gyung-sang, Jeon-ra, Gang-won, Chung-cheong, and Jeju province.
Gyung-sang dialect, I use, has tough and faster accent. So, when two person from Gyung-sang province talk to each other, people, who don't get used to hear their dialects, normally think the two person is arguing each other.
On the other hand, when I hear Jeon-ra dialect spoken by a angry person, I doubt he/she is really angry. Because Jeon-ra dialect sounds slow and relaxed to me.
To be honest, when I hear other dialects, I feel it's fun and funny. Most of Korean do, either.
And if a foreigner speak a dialect well, oh, he/she will be invited to a TV show^^
If you hear all kinds of the dialects, you can realize the differences between them.
Explaining in English writing is kind of hard work to me^^
