Manchuria.
In the past, it was under the rule of Gojoseon, Buyeo, Goguryeo, and Balhae, but now it had become the territory of China and Russia.
In fact, I learned that the concept of Manchuria didn’t exist in the past.
It was only when Japan invaded that the concept was created to emphasize the separateness of the region from China.
This was due to the Manchurian-Korean Historical Perspective, which was claimed by Japan to justify its invasion of Manchuria.
In the early 20th century, Japanese scholars disparaged the history and culture of the Korean Peninsula as being dependent on Manchuria, saying the history of Manchuria and Korea was one.
Although it was cut off when Japan collapsed, the Manchurian-Korean Historical Perspective was merely a claim to justify the invasion of the Korean Peninsula.
Anyway, the area north of the Tumen River that the Heavenly Demon told me about was Jilin Province, one of the three northeastern provinces in China, or the Kirim Province.
Specifically, it was Yanji City in th...
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