Best GoSeoul approach
For BTS-related travel, GoSeoul should focus on public tourism campaigns, scenic fan-photo stops, music neighborhoods, album shopping, and places that work as normal travel even for non-fans.
Seoul
Use HiKR Ground, Hongdae, Seongsu, and Myeongdong as a safe K-pop culture loop.
Gangneung
Use the East Coast as a calmer fan-photo and beach trip with coffee streets and official city tourism links.
Campaign context
Korea tourism campaigns are useful when they are officially published. Avoid implying personal travel recommendations unless a source clearly says so.