Jumunjin Port and the BTS Bus Stop are different stops. The port is a working fishing harbour; the bus stop is a recreated album-photo installation beside Hyangho Beach. Choose which one leads the outing before fixing transport and return time.
Go to the port for the harbour
The Korea Tourism Organization lists Jumunjin Port at 1758-22 Haean-ro and describes it as an active fishing port. Keep clear of loading and work areas. Nearby markets and seafood restaurants are separate businesses, each with its own opening and meal arrangements. See the port information.
Go to Hyangho for the photo installation
The BTS tribute is in Hyangho-ri, Jumunjin-eup, not at an operating transit stop. The KTO listing gives the location and Gangneung tourism contact; check the current setup and public access before making it the main reason for the trip. Check the BTS Bus Stop listing.
To combine them, check the date-specific bus or taxi legs between the harbour, Hyangho Beach and your return point. Keep one stop optional if the route or weather changes. A photo visit can stay brief; the port needs more time only if you plan a market or meal.