Formal: 죄송합니다 죄송해요 마안해요 Informal (밤말): 미안해

yea, you can see them in this video http://www.youtube.com/watch?v=BAfWbCq2mWk

미안해 is to friends or people who are younger than you. else, 미안해요. or 미안합니다. or 죄송해요. or 죄송합니다. 죄송합니다 is the most formal sentence.

hello , i also study korean ,we can learn together.