This article is from the Korats Breed FAQ, by Dennis Ganoe email@example.com with numerous contributions by others.
Korats will bond more closely to their human if they are the only cat
around, but some cautions should be observed with a single Korat.
The need for companionship is so strong in the Korat that a single
Korat should not be left alone for extended periods or ignored
when the caregivers are present (see Training, below). This may
cause the Korat to become aggressive or, more likely, very
withdrawn. Either of these conditions prevent the Korat from
exhibiting its true nature. If the Korat is left with only other
cats, because of their need for companionship, the Korat will bond
with one of the other cats. When multiple people and/or cats are
present, the Korat will bond with the individual they "like" best
or whomever they spend the most time with, be that cat or human.