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This study tests two versions of the Interface hypothesis, the strong and weak hypotheses, by investigating L2 processing of the realization of case marking in the Korean long-form negation constructions. In a self-paced reading study, sensitivity of adult Chinese L2 learners of Korean (n = 60) to the incorrect realization of case marking in the target constructions as efficiently as native speakers (n = 28). The results indicated both L1 Korean speakers and Chinese L2 Korean speakers spent longer reading times when the target constructions included an incorrect case marker at the syntax-semantics interface. Also the learners showed sensitivity to the case marking constraint in the target constructions remained consistent regardless of their Korean proficiency. These results indicate that L2 speakers can integrate multiple sources of information including case marking and aspectual cues when processing the Korean long-form negation constructions.