This research aims to explore the educational value of “difficult history.” We conducted genealogical research to discover the origin, definition, genealogy, and, eventually, the educational value of “difficult history.” To collect data, we set the recent publications about “difficult history” as a starting point and collected quoted research in the literature. Also, we conducted additional data searches in resources such as databases (Google Scholar, EBSCO, etc.) and that interviews with a prominent scholar of “difficult history” to expand our dataset. Findings are (a) “difficult history” originated from “difficult knowledge” (b) its definition is, although not totally agreed upon in academia, “representations of social and historical traumas in curriculum and the learner’s encounters with them in pedagogy (Zemblyas, 2014)” (c) its theoretical genealogies are psychoanalytic approach, critical socio-cultural approach, and social identity theory (d) its practical genealogies are “Inquiring the structure of ‘difficult history,’” and “Encountering others discourse through ‘difficult history,’” (e) and last but least, its educational value is to educate citizens who can live with others. Also, this research implicates that teaching and learning about “difficult history” creates a new momentum to transform history education by pursuing cognitive and affective balance, implementing the communication-oriented practice, and understanding students as ethical agencies who connect past, present, and future, and make, therefore, decisions and perform actions about issues related to “difficult history.”