In the summer when I was seventeen, the air was filled with the scent of grass left by the lawnmower and the sweetness of ice-cold soda. For Lin Mo, the only difference this summer was that the girl named Chen Xi shone coolly into his dull black and white world like a sudden mint-colored shimmer. This is a story about secret love, growth and two-way running. It is as innocent as a piece of white paper that has never been written on. Every stroke is full of careful exploration and heartbeat.