This is the 12509th most frequent Korean word.
대구에서
"In Daegu."
Here, '대구에서' specifies the location where I had the meal, emphasizing the place of the activity.
대구에서 식사를 했습니다.
I had a meal in Daegu.
In this sentence, '대구에서' indicates the location where I met the friend, again focusing on the spatial aspect of the event.
대구에서 친구를 만났습니다.
I met a friend in Daegu.
Here, '대구에서' describes the origin of the letter, modifying its source.