In an old alley in late autumn, Lin Wei huddled in front of a flower shop because of the rain. Chen Yu put the warm coat on her body. The Polaroid photo that fell from his pocket happened to be the daisy bush by the river where her mother often went. This accident caused the two to intersect: Lin Wei helped Chen Yu sort out his sister's old photos, and Chen Yu accompanied Lin Wei to retrieve the daisy seeds left by her mother. The mints in the old coat, the warm moments in the camera, and the dim street lights in the alley gradually melted the ice in their hearts. They finally understood that some encounters were not accidental, but the spring breeze passing through the cold winter, bringing new courage to each other.