This study investigates the correlation between proficiency and productive ability of learners of Korean. Learners’ productive ability was measured in terms of accuracy, fluency, and complexity. Accuracy was calculated as the number of error-free clauses by the number of total clauses in both spoken and written output. Fluency was calculated as the number of syllables per minute in written output, but the number of meaningful syllables per minute in spoken output. Complexity was calculated as the number of dependent clauses per t-unit in written output, but the number of dependent clauses per c-unit in spoken output. The experiment was conducted with 130 intermediate to high-intermediate learners of Korean aged 20 - 32 from China, France, Japan, and the US measuring their abilities of (i) written and spoken language ability measured upon accuracy, fluency, and complexity, (ii) global proficiency with mini-TOPIK. Written and spoken data were collected after seeing Mr. Bean movies. The results showed that (i) proficiency strongly correlated with every productive ability, especially with fluency. Fluency in spoken output proved correlated with grammar & vocabulary(.499), reading(.552), and total score(.559), whereas written output fluency showed correlation with vocabulary & grammar(.431), reading(.469), total score(.494), (ii) spoken and written output abilities are strongly correlated with each other from the highest (r=.688<SUP>**</SUP>, both fluency in written and spoken output) to the lowest (r=.231<SUP>**</SUP>, between spoken output fluency and written output accuracy), The study claimed that accuracy, fluency and complexity of both spoken and written output were strongly correlated with proficiency and they developed showing organic connection.