This place is totally unrelated to the romance, I just think the hiking route where Bong-soon’s mom and her friends went looks really beautiful. Haha.
This is Daedunsan Geumgang Gureumdari (viaduct) and I think the place where her mom and friends chatted is Ipseokdae. You can take cable car up here and it is the most beautiful in autumn with fall foliage.
(Pic Cr: Visit Korea, JTBC)