The learning problem addressed is that 8th grade students in Korea who studied abroad in 5th grade have difficulty understanding Korean history, specifically the flow and significant events of the Silla kingdom in the 6th century. This is because when they were abroad in 5th grade, they did not learn the historical terminology and background knowledge about Korean history that students who attended 5th grade in Korea acquired. Without this prior knowledge and familiarity with terminology, they struggle to comprehend the Korean history textbooks in 8th grade while their peers who remained in Korea do not have the same issues.