Are the Han people in the three northeastern provinces experiencing the journey? Before the Qing Dynasty, were there any Han people in the three northeastern provinces?

Yes, very few. During the Warring States period, Yan was part of Liaoning and Inner Mongolia, but there were no Han people at that time, and they were all Chinese. After the establishment of the Qin Dynasty, Liaodong County was established to govern the hometown of Yan State, and the Great Wall was built into the Yalu River. After the Han Dynasty, Liaodong County even included Korea. After the Han Dynasty, Liaodong was always in the hands of the Central Plains Dynasty and the Northeast Dynasty. It was not until the late Qing Dynasty that a large number of immigrants with practical significance appeared. The vast area from Xing 'an Mountain range outside Heilongjiang in Jilin Province to the sea area is the hinterland of the Northeast Dynasty, and many prosperous and civilized dynasties have been established, such as Goguryeo and Bohai Kingdom. There are very few Han people. Only after the demise of the Qing Dynasty did there exist Han people.