North South States Period
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North South States Period(남북국시대, 南北國時代) refers to the period in Korean history from the 7th century to the 10th century, when Unified Silla and Balhae coexited at the south and the north[1], [2]. Hitherto, this period had been called the period of Unified Silla. However, scholars assert that this period must be called North South States Period of which the north state is Balhae and the south state is Silla because the unification by Silla was imperfect, and the people of destroyed Goguryeo had established Balhae.