Feng zhi Wu is the first game in Xuanyuan Jian series which is set in a concrete historical time period - ca. 5th century BC. Some famous figures of Chinese history appear in the game, such as the great philosopher Mo Zi (whose name is sometimes latinized as "Micius"), the architect Lu Ban, and the military strategist Sun Bin.
After you complete the underground part of the Demon Tower, you can find a very amusing Easter Egg. You just have to examine a certain object in the underground dungeon (I won't say which one, because it wouldn't be fun to discover). When you examine the object, you find yourself magically teleported into... *gasp*... the room in which the game was developed! There, you find the developers of the game working with their computers, or simply doing silly things. You can talk to them, and some of them will even teach Hu Yongcheng and Wen Jin new techniques to use in battles!