The aim of this study is to investigate sub-factors of reading fluency and reading errors among Korean learners and to analyze differences across Language(English, Spanish, Chinese). We predicted challenges for Chinese readers in fluency speed due to their transparent writing system, and for English and Spanish readers in accuracy. Surprisingly, English learners showed higher speed and accuracy across all groups. Comparing the types of reading errors, phoneme substitution and repetition errors were the most common in all languages, but different characteristics are also observed across languages. The results of the study show that even intermediate learners can make many errors in phonetic reading, and the need for pronunciation training is confirmed. It is also emphasized that it will be difficult for them to develop into proficient readers at the advanced stage if their reading fluency does not improve. This study explored language-specific differences based on actual learners' phonetic reading, and can be used as a basis for future controlled analyses of language-specific differences.