Several times when Su Zimeng was riding the subway, staring at the glass in a daze, he thought of Li Feng. The serious boy who usually smiles casually, but when he smiles, he has a dimple in the left corner of his mouth. However, at the door of the bar, the boy in my memory had a stern look on his face, like the southern winter wind, cold to the bone. He was wearing a thick black sweater that seemed to melt into the night.