This study aimed to review previous studies on L2 learners' social variables in L2 acquisition to see current research orientation. and propose future studies in L2 Korean acquisition. To meet the goal of the study, studies on L2 learning in study abroad(SA) environment, comparison studies on L2 learning in SA environment and at home(AH) environment, studies on L2 contact profile and social interaction in SA environment, studies on L2 learning with complex variables with social, cognitive and affective variables, and studies on learners' social variables in Korean language education field were reviewed. Consequently, the study claimed the necessity of studies on learners' social variables based on the fact that it could give many fruitful results applying directly to learning and teaching practices. (Kyunghee University)