Covering political and diplomatic history, frontier history, social history, and cultural history, this book takes readers to see the trees and the forest—not only to have a deep understanding of the content of each book, but also to clarify the author's awareness of the problem, academic origins, and the academic tradition on which it is based. The author combs through the research of Chinese history and Korean history in the English-speaking academic field, and also analyzes a number of academic monographs like a sparrow. Through these research notes and book reviews, the author points out that there is more than one way to write history, and scholars in different academic circles have written their own unique histories based on their own awareness of problems and academic traditions, and thus invented each other.