Nanshantun is a remote small place, but the green mountains and clear waters are particularly supportive. There are hundreds of simple families living at the foot of Nanshan. Unfortunately, most of the children went to the city when they grew up. Basically, no one was willing to come back to this almost isolated place. Maybe they disliked that it was too backward. Zheng Yang was a 21-year-old college student who had just graduated. Like all young college students, he once had great ambitions and wanted to make a big career. Then he returned to Nanshantun in a glorious way to see what he had achieved. But after four years of college, he deeply saw through the bright lights and wine of the city. He was tired of it. He missed the green mountains, the green water, and the person in his heart...