죄송합니다 / 죄송해요 <- This sentences made little bit more formal word. it means sorry. 미안합니다 / 미안해요 / 미안해 <- This is 'I'm sorry' too. 죄송 > 미안

죄송합니다 -chwe song ham ni da - I am sorry (formal) chwesonhamnida 미안해[요] - mi ahn hae [yo] - I'm sorry; Sorry (informal) mianhae[yo]