This paper presents a unified approach to multiple nominative and accusative constructions in Ko-rean. We identify 16 semantic relations holding between two consecutive noun phrases (NPs) in multiple case marking constructions, and propose each se- mantic relation as a licensing sondition on double case marking. We argue that the multiple case marking constructions are merely the sequences of dou-ble case marking, which are formed by dextrosinistrally sequencing the pairs of the same-case marked NPs of same or different type. Some appealing cones-quences of this proposal include a new comprehensive classification of the se-quences of same-case NPs and a stratightforward account of some long standing problems such as how the additional same-case NPs are licensed, and in what respects the multiple nominative marking and the multiple accusative marking are alike and different from each other. (Chungnam National University)