I am very suspicious of this story because I find it hard to believe there is a population of Asiatic black bears living in a stretch of land 4 kilometers wide. This just seems very convenient when the Moon administration has been pushing to turn the DMZ into a so called “Eco-Peace Park“:

A rare Asiatic black bear cub has been photographed while crossing a stream in the Korean Demilitarized Zone.

A rare Asiatic black bear cub has been photographed while crossing a stream in the Demilitarized Zone, highlighting the heavily fortified Korean border area’s role as a unique haven for wildlife.
The photo of the bear, which was captured by a motion-sensor camera in October, emerged as the fate of the DMZ is in question amid efforts to improve relations between the two Koreas and persuade the North to abandon its nuclear weapons.
The 2.5-mile wide, 155-mile long strip of land has been largely a no-go zone for more than six decades due to land mines and barbed wire-lined fences in place since the 1950-53 Korean War ended in an armistice instead of a peace treaty.
Untouched by development, animals and plants have thrived with little human contact in the protected ecosystem that includes wetlands, forests, mountains and coastlines.

Stars & Stripes

You can read more at the link, but I wonder if this bear is a cub from bears reintroduced into the wild in South Korea and wandered into the DMZ from another area in Gangwon-do.