The objective of this systematic review is to examine the existing literature and highlight the current criteria for judging and analyzing errors in L2 Korean passive voice. This systematic review is a result of the analysis of 14 primary studies obtained after utilizing a search strategy for selecting papers found on a web database. we found that there is a lack of effective and robust grammatical error analysis criteria for the classification of errors. We present several prominent and useful methodologies that facilitate a precise description of errors. Errors could be better understood and classified if considering 1) the “language area and word class” affected, and 2) categories of error: omission, addition, and wrong substitution. When demonstrating errors related to learners’ intention, several factors need to be considered according to the given context. In collecting and examining data, it is necessary for researchers to obtain sufficient knowledge about the correct use of research methodologies in order to gain desirable results.