This study aims to investigate the perceptions and obstacles faced by EFL learners in the implementation of blended learning in an abnormal learning system. A group of undergraduate EFL learners, consisting of 48, who has completed a Grammar Class, participated in the study. The 48 learners formed three different learner category levels; High, Moderate, and Low. The learners of the three different category levels filled in a semi-structured open-ended questionnaire and responded semi-structured interviews. The low category learners perceive that learning grammar through blended learning is meaningful but need more experiences in the utilization of online learning mode, and in-availability of the supporting tools; The moderate category learners perceive blended learning to provide them more study times and make them get used to the internet or online-based learning; and the high category learners perceive the implementation of blended learning as helpful, easier, flexible, and fun. Although the learners of the three different categories level face the same problems on the implementation of blended learning, namely poor internet connectivity at home and campus, unclear online instruction, and delay to respond questions on the online learning mode, the learners of the low category level, on the other hand, experience problems applying online learning mode. We discuss the practical implications of the research results for the successful implementation of blended learning in the future, especially for low proficiency learners and in situations of abnormal learning systems.