On the rooftop of the school in the afternoon, Zhi Zhi, who was sleeping, dreamed of playing with Cai Hua on the playground, but suddenly it turned to that rainy day ... Zhi Zhi woke up and found a letter from him, because he didn't come to class in the afternoon, and Tzu Chi Xin also asked him about his relationship with smile. Knowing that they were just friends, Xin left excitedly. At this time, Xiaoxiao came to look for wisdom and went home together ... It rained, but Smiling only found the wisdom of silently looking out of the window ... Wisdom also reviewed in the library for tomorrow's exam and met a letter that he found because of Smiling. The letter just wanted to express it with a smile, but it had a quarrel in the library because of the indifference of wisdom. After the exam, Zhi also received a letter with only a smile and hurried to the park. There, I met a rejected letter, and then I caught up with the smile ... Wisdom also agreed to play with the smile on the playground, but it reminded him of colorful flowers ... On the night of the playground, the smile left tears after explaining his feelings ... The next day, after school, I found in the smile drawer of the school that the wisdom who took photos with the three of them finally understood the intention of the smile ... Only after asking the letter did I know.