Is Korean the same as Korean? If I study Korean and travel to Korea, can Koreans understand me?

Similarly, I am Korean, but my tone is a little different ~ Korean has many foreign words (English)! Qkrwnstjr and you, don't listen to his nonsense. Junichi SB doesn't know anything at all. Koreans hate Yanbian Koreans, but rarely because they think Koreans are arrogant and don't listen to their superiors. You are Han, but you can speak Korean. Koreans will admire you. Koreans are of good quality, not because I am from Yanbian, as he said! . . Believe me, I plan to go to Korea, too, but there is really no place to go in Korea except Jeju Island and Seoul.