For this location I picked the Gimhae Daeseong-dong Tumuli due to easier map location, with Gimhae also being a rather large town instead of what appears to be in the middle of nowhere to find the other Haman Malisan Tumuli. Parking is just next to the large museum and the museum is entirely free! There is an information desk but the guy didn't speak anything but Korean so I just went ahead inside. The signs are available in Korean and English and are in great detail. I found out much more than expected. They also call this site as being "temporarily" listed as UNESCO rather than tentatively...interesting!

Once you go through the museum you can freely walk on top of the actual tumuli, a large burial mound and reminiscent of the Viking ones in Scandinavia. At the start is a burial chamber you can look inside with a few signs but overall it is just a walk to stretch your legs, making that small ascend for a higher overview of the site, and then making your way down towards the parking lot if you are done here.

Whereas the site is surely important for Korean history I'm not sure what they expect to see as unique value to the rest of the world.