This paper investigates Korean-Chinese bilingual speakers’ processing of Korean plural marker -tul. It employed masked priming experiments with a word judgment task for Korean-Chinese speakers from Yanbian, China. The masked priming experiments compared the subjects’ response time in three different prime-target pairs: identical condition, unrelated condition, and test condition. The data of the experiments was analyzed in two different ways: subject analyses and item analyses. The subject analyses of the study showed partial priming effects and the item analyses full priming effects. These findings indicate that Chinese-Korean bilinguals seem to be sensitive to morphological structure of a morphologically complex words in Korean and less dependent on the lexical storage of the full form, as is usually found in L2 learners’ morphological processing.