Dongnaeobseong Castle is located in Dongnae District in the metropolitan city of Busan. It was built to protect the city from invasions. Its construction began at the end of the Goryeo Dynasty, and historical records show that its wall was restored in 1021, the twelfth year of King Hyungjong's reign ( Hyeonjong) of Goryeo, the castle was restored and expanded in 1713 to expand its circumference to 5240 meters, and had four gates, and a fortress wing was built on the south gate, and small fortifications were erected on the other three gates, and at present, there are some structures that have been restored Inside the wall, including the north gate with the fortification on top and a small fortified wall surrounding the gate.