Hand to hand with Wild Boar?
Not on this old fatman's list of adventures.
Seriously, trying to use any weaponless martial art on a wild pig (or most anything else truly 'wild') is not recommended. However, Seoul is a major city - even in the suburbs firearms would not be the first choice. Not if I were choosing for my neighbors, anyway.
I think the old sport of pig spearing might be making a comeback. Yeah, it's dangerous too, but one does not kill or wound as many folks on the next block.
Nets could be used, too; but then one must unwrap the piggy. Hazard pay.
Spears or long knives. A spear for me, if you please. With a crossbar at the base of the blade to keep piggy at yonder end of spear.