한국에서 "아저씨"는 나이든 사람든 일반인을 칭할 때 사용합니다. 즉, 사귀는 남자를 부를 때는 이름뒤에 "씨"를 붙여 부르시면 됩니다. In Korea, you can refer to the middle -aged man as " 아저씨", so of couse, you need to add the "씨" after first when you call your boy friend. Your boy friend must be upset if you called him " 아저씨" so that I strongly recommend you to call him "오빠" instead of addng '씨" after first name. I can guarantee that you can see the difference immediately by calling him " 오빠" Try and see it.