处于青春期的少年人总会有因爱而生的或忧伤或甜蜜的小情绪，克磊（范植伟）与歆荷（李康宜）也不例外。两人是台湾某所高中普通高二生，分别在于，一个沉默孤傲，数学成绩一极棒，在学校属“王子”，另一个则整天幻想上帝派她一个同她有一样想法的男朋友，数学成绩超级烂，属“灰姑娘”。当两人由校长牵线（克磊帮助歆荷补习数学）而结识时，相处初期没少矛盾和别扭。但时间慢慢向前，一种说不清讲不明的时开心时沮丧的感觉从彼此心中生出，而雨季来临时，无法见面自不会再争吵的两人，都分明感受到了时间的停滞不前。心事所趋，歆荷做了个晴天娃娃乞求天晴，故事开始朝之前两人不曾想过的方向上走。

When novelist Hyun-soo moves to a new place, he is suddenly visited by a strange woman who says that she used to live there. Hyun-soo and Jeong-yoon discuss a movie Jeong-yoon plans to make, but this results in them breaking up and say their goodbyes. A stranger named Yoon-joo tells Hyun-soo a secret about his dead wife So-young, and he decides to go explore her past. Novelist Jeong-yoon goes to meet Yoon-joo, the person she based her novel on, in order to finish some business. They are all wandering, in her memories, in his novel and in their movies...

我常对她的背影陷入幻想中。她是什么样的人？喜欢做什么？拥有何种世界观？并从平时细枝末节的观察中兀自推断出许多莫须有的线索……在一系列的畅想后，我突然发现在脑内与自己对话的她其实只是自己一厢情愿的想象罢了。由此，当重逢的某日，我决定踏出这一步……

洪瑜、丘有为和尤湘三个年轻人寄居在校外一间宿舍中，邻居是已故银行家李某一家。洪瑜悄然爱上了李家小姐李小鸿，二友鼓励洪瑜写信，终得回信，原来小鸿也钟情于他，二人就此难舍难分。父亲病危，洪瑜归家。洪父临死前嘱其与表妹风飞结婚，以报风父资助之恩。万般无奈洪瑜遵从父命。尤湘和有为指责洪瑜，并让他与小鸿见面。小鸿得知真相，忧伤成疾。洪瑜去巴黎留学，风飞不耐寂寞与洪瑜离婚。洪瑜赶去告与小鸿，小鸿却已近弥留……