What is happiness? You smoked the smoke, I sold the red dates in the valley. More and more people are inseparable from telephone, internet, and urban life, and they still stay in the ancient house of two hundred years - cave, maybe wait for decades, like other caves Grass is born. And they just want to stay in this time and enjoy the beauty of this moment. Lvliang Cave Dwelling in Shanxi Province, the original Shanxi folk house.