C380 Goodbye Su Ning

There is yin and yang, everywhere, the sun is yang, and the moon is yin, and so on and so forth: the day is yang, the night is yin, the spring is yang, the autumn and winter is yin, the mountains are south, the rivers are north, the mountains are north, the rivers are south, the males are yang, and the females are yin...

From Mu Yun's words