With the help of globalization and internalization, English has been established as the language of academia and the lingua franca of the world (Seidlhofer, 2004). Due to this trend, many countries, where English is not spoken as an official language, have implemented different English teaching methods that aim to promote ELLs' language proficiency and communicative competence (Huang, 2015). One of the recent trends is the implementation of English-medium instruction (EMI). In the context of East Asia, the adoption of EMI in higher education has been spearheaded due to worldwide university rankings, which is important for a university's globalization index, which includes percentages for English-medium classes and the proportion and numbers of international faculty and students (Cho, 2012). Since the early 2000s, the Korean Ministry of Education (MOE) has strongly advocated for the use of EMI courses and lectures from elementary to higher education in Korea (Ha, 2011; Kym & Kym, 2014). To comply with the MOE's recommendations, many Korean universities have implemented various policies to make EMI courses mandatory for certain majors or disciplines (Cho, 2012; Ha, 2011; Kim, Kweon, & Kim, 2017). Such EMI courses aim to train students to become fluent English speakers and professionals in diverse workplaces and various fields that use English as a common means of communication. EMI courses are also offered to prepare students for short-term study abroad experiences in English-speaking countries, such as the USA or UK (Cho, 2012; Ha, 2011; Kim, Kweon, & Kim, 2017). Previous studies have reported the pros and cons of implementing EMI in ELT (Dearden, 2014; Tsou & Kao, 2017); however, previous studies have failed to directly compare teaching methodologies such as communicative language teaching (CLT) and the grammar-translation method (GTM) when preparing students for overseas experiences using the English language. Thus, it is important for researchers to begin to compare such diverse methodologies and assess how students view such methodologies while preparing for use of the English language in context. Such studies will contribute to the existing literature and provide pedagogical implications for diverse teacher educators in ELT. This report examines university ELLs' perceptions of English improvement, evaluation of the course curriculum, and their