I did some research to see where those Dal.Komm cafes that appeared in ep 1 and 2 were.
Ep 1 달.콤커피 분당정자점
The place where Yoo Shi-jin and Seo Dae-young chatted and found that his phone was stolen.
(Additional note: This is also the cafe where the two couples double dated in Ep 13.)
If you click on the link above, you can see the google map for this shop, it is very close to Jeongja station. The closest exit should be exit 3. It is quite far from Seoul, this shop is in south of Hangang region, further south to Gangnam region, it will take more than 1 hour to get there from central Seoul.
Ep 2 달.콤커피 송도센트럴파크점
The place where the couple “broke up” without starting a relationship.
(Additional note: This is also the cafe where Song-Song couple said they loved each other for the first time in Ep 15.)
This shop is in Incheon, it will take almost two hours to get there from central Seoul. The closest station is Incheon National University Station, just get out at exit 4, walk straight and turn left, you can get there. In the map below, the metro station at the bottom is Incheon National University Station, and the area in red is Song-do Central Park Prugio City, which is where the cafe is located.
Related Location: Dal.Komm coffee in Ep 6