Three Kingdoms: Bronze Mirror Space, Watch Zhang Fei Fight the Tiger at the Beginning

The old man dug out a bronze mirror and cut his hand, opening a light door that allowed him to travel back and forth. He broke into another world with a crossbow and realgar wine, and met a strong man who killed a tiger with his bare hands - he said his name was Zhang Fei. Is this world the Three Kingdoms? I can go back to the other side of the bronze mirror. I have to figure out how big it is on the other side of the door first.