The article delves into the 200-year history of the long-forgotten kingdom of Balhae, focusing on its significance in the region as a major trade mediator rather than merely a weak power subordinate to the Tang dynasty. It categorizes Balhae as a connecting state that bridged agricultural and nomadic societies while facilitating interactions between the continent and the ocean. The piece presents a nuanced perspective by mapping out four vital trade networks that defined Balhae's history.

Specifically, the article references historical trade routes such as those to Japan, Shilla, the tributary paths to Tang, and connections to the Koryo area. It identifies these routes as the western network leading to the Tang dynasty, a northern network linking the nomadic cultures, a southern connection to Shilla, and a maritime route extending to Japan. These historical pathways portray Balhae as a pivotal player in Northeast Asia's historical and economic landscape, challenging prevailing views that diminish its importance.

Author Jeong Ui-gil, who has contributed to the restoration of northern history through his work with the Goguryeo Research Foundation, presents this exploration in a travelogue format making it accessible and engaging. He weaves together historical sites, like the former capital of Sangjing and major ports, connecting Balhae's past to contemporary locations of interest in Northeast Asia. The article acts as an insightful guide for those wishing to traverse the historical landscapes of Manchuria, affirming that the region was not merely a history outside of Korea's narrative but a vital area of trade and cultural exchange.