We are a dynamic research group at Sungkyunkwan University (SKKU). We aim to develop Machine Learning/Data Mining models on inter-connected data (e.g., human interactions, social networks, knowledge base, education logs, and sensor networks) and Natural Language Processing (e.g., knowledge-enhanced question/answering and logical/symbolic reasoning). The current research topics include knowledge discovery, user modeling, commonsense reasoning, knowledge tracing, recommender systems, explainable AI (XAI), and computational social science.