The purpose of this study was to understand how L2 learners choose a sentence structure and figure out the effective implicit learning methods of grammatical knowledge acquisition. To examine the syntactic priming effect, this study designed a three-step experiment: pre-test, treatment, and post-test. The participants carried out a sentence completion task and an acceptability test during the pre-test and post-test steps. For the priming treatment, participants were asked to repeat the Korean sentences that they had heard. A total of 75 Chinese and Japanese Korean leaners whose Korean level was higher than TOPIK 5 participated in this study. The results showed that there was a significant change in the production of Korean movement construction in the Chinese learners group but not in the Japanese group, except in their production of divergent movement construction. There was a significant increase in the “lul” construction use frequency among all the participants. This indicates that implicit learning methods, such as syntactic priming, can be effective in teaching grammar such as particle alternation.