This paper reports the syntactic distribution of amu-N-to/-ilato/-ina phrases, which are representative polarity sensitive intems (PSIs) in Korean, and accounts for their semantic characteristics in terms of “arbitrary choice quantification” and “concession.” In the first section, we extensively illustrate the distributional behavior of the PSIs in various constructions and roughly generalize the distribution in terms of “(anti/non-) verdicality.” Section 2 claims amu denotes an arbitrary choice quantifier, and the particles -to//ilato/-ina as “Concessive” markers, so the compounds denote a special element in a pragmatic scale determined by context/situation. Section 3, based on the pragmatics of scalar implicature, accounts for the apparent ambiguity of PSIs between “universal” and “existential” readings, and further characterizes the difference among the concessive markers -to/-ilato/-ina in terms of “quantity/quality scale.”