This book describes that the first state of Korean is Gojoseon, and then it is succeeded by several states such as Gija Joseon, Samhan, Buyeo, Ye, Maek, Okjeo and Suksin.
The Book of Later Han puts the section of "Dongyi liezhuan (東夷列傳)" and covers Buyeo, Yilou, Goguryeo, Eastern Okjeo, Hui, Samhan and Wa, in other words, eastern Manchuria, Korea, Japan and some other islands.