Lin Zhizhi and Shi Yan are childhood sweethearts who have lived in the green mountains since childhood. Lin Zhizhi has always secretly liked Shi Yan, but she didn't dare to tell him. However, the willful Lin Zhizhi didn't like him being with other girls. Shi Yan was very good, so she also worked hard to become good. She kept chasing and chasing, but later, one day, she knew that Shi Yan had always wanted to get out of the mountains. He had ideals and had rewards. But she herself just wants to be a tree in the mountain. Maybe as long as she can be with Shi Yan, she can ask for nothing, but he said that she is just his sister. Shi Yan was still so good, she felt so tired, she couldn't catch up with him, and she didn't want to chase him anymore. Shi Yan left and she stayed. She thought she no longer loved him. However, when a letter from afar was sent to her, everything began to change again...