안녕하세요. :) "-겠어요" usually expresses "my will or plan", in the other hand "-겠군요" indicates a guessed future event. In the most cases, the subject of the sentence "-겠군요" is third person Not "I". "-겠어요" It may be translated as "will/am going to” or “plan to”, express "the will" and "intent" of the speaker. - "저는" 담배를 꼭 끊겠어요. I'm going to stop smoking. - "저는" 그 일을 하겠어요. I'm going to do the task. "-겠군요" It may be translated as "I see/guess that he/she will do". - "그 사람이" 담배를 끊겠군요. I guess that he will stop smoking. - "그 사람이" 여행을 가겠군요. I guess that he will travel.