Believe that: enduring long-distance relationships is a lifetime. The story revolves around Zhao Yiyi (played by Ren Min) and Xu Jiashu (played by Xin Yunlai). After the college entrance examination, Zhao Yiyi finally confessed to Xu Jiashu, whom she had secretly loved for many years, but accidentally started a long-distance relationship. They firmly believe that: enduring long-distance relationships is a lifetime. But the natural obstacles of long-distance relationships test them. They are obviously in love, but they are constantly absent from each other's lives. The appearance of Sai He (played by Chen Youwei) and the twists and turns of the love between besties Qiao Qiao (played by Zhou Yutong) and Li Tang (played by Li Xiaoqian) made Zhao Yiyi feel a lot. When a long-distance relationship is upgraded to an international relationship, should they continue to persevere or part ways? The two who have grown up separately have to face the answer in their hearts...