This study investigated Korean university learners' perception of native English speaking teachers(NESTs) and non-native English speaking teachers (NNESTs) in the University English for academic purpose. Questionnaire survey and interview data collection were implemented. For the questionnaire survey, 118 students participated for NEST courses and 127 for NNEST courses. Among them 10 students(5 from NEST, 5 from NNEST) were interviewed to consolidate the data. The results revealed that students perceived more positively in the English speaking courses by NEST with regard to improving their listening and speaking ability, NESTs' teaching attitude which intrigued students to participate in the class, trying to ask questions in class, and keeping their tense during the class with English language code. However, students in NNEST courses felt less anxiety, used more L1 in group work, and tended to ask questions later the class in Korean than in NEST course. Students in NNEST courses perceived positively about L1 use as long as it is controlled. These findings are valuable implications for NNESts to manage their EAP courses effectively.