To build on the above, the same distinction exists in English. It's the difference between 'sorry (죄송하다, 미안하다) and 'apologize' (사과하다) To apologize is an action while sorry is a state of being. 'Saying sorry' is the act of apologizing. An apology is the act of displaying that you feel sorry. Of course, we often naturally shorten these expressions to a simple "Sorry" the statement itself is "I am sorry" - a description of being. As such, just as Hailey showed in Korean, is again true in English. Sorry can't be conjugated as a verb (I sorryed, I am sorrying) while apologize can (I apologized. I am apologizing.) The usage in Korean may be confusing as they can both be used with 하다, just keep in mind that

simply.. 사과하다 : to apologize to someone. 죄송하다 : when you feel bad toward someone, you can say 죄송하다 which explains your mood.

사과하다 a verb that means 'apologize' 죄송하다 an adjective verb that means '미안하다', but 죄송하다 is a honorific expression which you will not use with friends. To distinguish a motion verb and adjective one, add '-자' to it and see if that makes sense. 사과하자. Let's apologize. 죄송하자 doesn't make sense.

Almost same. And you are right. A : I did something wrong to C 나는 C에게 잘못을 했다. B : Then you have to go and apologize to C now. 그럼 너는 지금 C 에게 가서 사과해야 한다. A : Hello, C. I am sorry about it. 저기, C. 그것에 대해 죄송합니다 ( or 사과합니다). C : It’s ok. 괜잖아요. B : Did you do it? 너 사과했니? A : Yes, I did. 응, 사과했어.

사고하다 it's means Apologize and 죄송하다 .it's means sorry!!!