The true flowering period of sunflowers is in late summer and early autumn, not in midsummer. Sixteen years ago, the little boy in the sunflower class handed a sunflower to the crying girl. He finished the painting and left; she waited for sixteen years, and what she waited for was autumn - not midsummer, but the residual warmth of late summer, the coolness of early autumn, and the two of them finally stood side by side in front of the same door. Sunflowers don't bloom in the summer, they bloom in the moment of waiting for the end.