The story takes place in the 1970s. Zhao Yongyuan (Nicholas Tse) and An Ran (Gao Yuanyuan) are like two duckweeds blown by wind and rain. Their similar life experiences and pessimistic circumstances tie them together tightly. As time goes by, a sincere and pure friendship develops between them. More than a decade later, the wheel of history has forced Zhao Yongyuan and An Ran to move forward. The two who were originally separated from each other meet again. At that time, An Ran has grown into a beautiful girl. The childhood friendship has turned into a passionate love. An Ran and Zhao Yongyuan both firmly believe that nothing in the world can separate them again, but the reality is just the opposite. Between the vast world, can their feelings remain the same? In the vast sea of people, will fate arrange for them to meet again?