I sat down on a raised rock, and in front of me was an empty valley, lush with trees and grass, and a sea of green. In the distance, there are still mountains, forests, vertical and horizontal roads, and rows of tall buildings... but my heart is empty, like an unobstructed endless sky. I feel that the past days have been busy and empty. Sitting in front of the desk, walking at the entrance of the hutong, passing through the pedestrians, the days like water, the soul floats in the suffoca...