This short paper investigates the complementary distribution and meaning interpretation of Korean NPIs "amu-(NP)-to" and "amu-(NP)-irato", which include these individual elements: indefinite "amu", additive particle "to", copula "i", and declarative marker "ra". The current paper aims to provide a novel analysis by combining our existing understanding of these elements and the notion of inquisitiveness in Inquisitive Semantics.