Craseomys regulus occurs south of the Gaema Plateau on the Korean Peninsula. A National Institute of Biological Resources account describes a reddish-brown back, brown sides, and dark-grey underside.
The back is reddish brown, the sides brown, and the underside dark grey; the tail is dark above and grey-white below.
The account describes social animals using burrows with a nursery chamber and a place to store food.
An extinction-risk assessment has not been added yet.