Jindos have not, as a breed, been fully domesticated. A wide feral streak is present in the dogs, and probably accounts for the value which the Jindo holds as a hunting dog. Jindos are excellent hunting dogs. Dogs of this breed have been known to hunt and bring down all sizes of prey on their own, after which the dog will either bring the animal to its human or vice versa. Jindos living in the wild on Jin Island have been seen hunting in packs. (I guess that Jindos are similar to a slightly domesticated Dingo!)
Jindos are also incredibly loyal. There are dozens of stories about amazing journeys made by Jindos, just so that they could return to their human families &/or territory. Once a jindo has established his/her sense of family, pack, etc., he will be extremely protective, posessive and will stick around forever. (these 'senses' are established early and this is probably a good thing, as there are no leash laws in Korea) Because of this strong sense of loyalty, it is not a good idea to adopt a jindo that is more than a few months old. It will try to return 'home'.
In addition to this incredible loyalty, Jindos are also exceptionally intelligent. As mentioned above, they are able to find their way home over great distances (thousands of km) using many means. Jindos have been seen trying to hitch a ride on the ferry to Jin Island, have displayed Houdini-like abilities and have shown that there is no end to their resourcefulness. Not just resourceful, Jindos also learn and adapt quickly. Jindos become house trained in 1-3 days (they do this on their own) and can be trained to tasks in a similarly small amount of time. HOWEVER, with this intelligence comes a strong will. Jindos are "independent thinkers". They will obey given commands- but only if it suits them to do so. (I am sure my family can comment on this!)