The purpose of this study is to examine the Indonesian correspondences of Korean complex sentences based on the parallel corpus of Korean and Indonesian. The first set of findings show that in the cases where ‘-는데, -고, -아서’, and ‘-니까’ are used as connective endings, the conjunctions corresponding to the connective endings mostly do not appear in Indonesian sentences, so this study predicts that Indonesian learners may have difficulties in constructing complex sentences using ‘-는데, -고, -아서’, and ‘니까’. Furthermore, the data of '-는데' and '-고' that correspond to Indonesian conjunctions are relatively lower than ‘-아서’ and ‘-니까’. Hence, this study predicts that constructing complex sentences using ‘-는데’ and ‘-고’ will be more difficult rather than using ‘-아서’ and ‘-니까’ for Indonesian learners. The second findings show that in the case of complex sentences using transformative endings, the use of adnominal clauses are more frequent in Korean sentences. Moreover, the order of the adnominal clauses and main clauses in Korean complex sentences are frequently realized in inverted sentences in Indonesian language. Consequently, this study predicts that Indonesian learners will have difficulties in analyzing Korean complex sentences containing adnominal clauses. The last findings show that some data related to Korean simple sentences correspond to two sentences in Indonesian language in which they are asymmetric correspondences. The findings refer to sentences containing ‘에’ which has the meaning of ‘conditional situation’ or ‘addition’, ‘로’ which has the meaning of ‘additional explanation’, and Korean sentences related to appositive structures, parallel structures, and predicate noun structures. This study would be meaningful in that it attempts to contrast the structures of sentences rather than the form of grammatical items based on a parallel corpus.