Banhakgi is a patent-based app for problem-solving repetitive learning. It automatically repeats key questions in various categories such as Chinese characters such as elementary, middle and high school TOEIC required English vocabulary and grammar questions, English conversation, Korean language vocabulary, social/science, and natural language, Korean history/Chinese character proficiency test, licensed real estate agent, common sense, medical terminology, and provides functions such as setting the number of questions by day, automatic execution, setting the number of intermediate repetitions, storing memorization completed, and providing random OX by day, infinite multiple-choice questions, solving incorrect answers, and storing scores.