From Seoul, check Korail or the subway to Suwon, then search the route to Haenggung-dong on Naver Map (English UI).
Lovely Runner: Haengnidan Street
Paldal-gu, Suwon
VisitKorea’s Lovely Runner course opens on Haengnidan Street as Sun-jae and Sol’s first-date neighborhood; Herald highlights café Mong Ted as Sol’s house exterior and the rainy-scene umbrella.
VisitKorea: Sol and Sun-jae’s route to school, including the wall-corner confrontation scene. Herald points visitors toward Yeonmu-dong / school-route alleys near the fortress walk.
VisitKorea and Herald both highlight the bridge in front of Hwahongmun as the spot where Sun-jae (Byeon Woo-seok) confesses to Sol (Kim Hye-yoon), with the seven stone arches as the classic fortress backdrop.
VisitKorea: the pavilion where Sun-jae taught Sol to ride a bike. Herald ties the bicycle help scene to the Yongyeon Pond / northeastern pavilion area of the fortress.