Bal-Hae

All Koreans think that Balhae is Korea's history, but Chinese says that Balhae is their country because most of Balhae people came from China. However We Korea has a specific reason why Balhae was our territory and our history.

FIrst, Balhae's tomb looks like Goguryeo. They are both our history because Balhae is the country that was made after Goguryeo, so they are our history.

Second, in the book in Japan and poems in China saids that Balhae is Korea foreign country, and in 'BalhaeSa', the Balhae king wrote that he is the king of Goguryeo.

Third, Balhae uses Ondol, the floor heating system from Goguryeo, since they are in the cold places they used floor heating.

I think that Balhae is definitely Korea's history.