In that scene, you can see that the sign that says “Small Library” is the same as the one in the photo below.
Semyeong Elementary School, which Yesol attends, was modeled after Solbit Elementary School in Bangok-dong, Sejong City... The photo was taken by imagining what the 2nd complex of Surubae Village would look like from Yesol's perspective.
However, it is said that actor Oh Ji-yul goes to Naseong Elementary School in Sejong City.
The composition of Jeon Jae-jun hugging Ye-sol
This is the exact location where the scene was filmed.
View from the other side of the crosswalk
Photo taken after crossing the crosswalk. The banner hanging at the school (which says, “All are flowers”) is the same.
Meeting place between Kang Hyun-nam and Moon Dong-eun
It appears to be the parking lot of the Sejong City Arboretum.
An island in a lake park as seen by Kang Hyun-nam and Moon Dong-eun
It's a little far away, but it's the same... Honestly, I know where the scene in the drama is, but it's a bit far to get there.