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故事发生在三十年代的上海，欧阳日为私家侦探，后其父遭暗杀，欧阳日为父报仇展开侦查，发现最大嫌疑人竟是其童年好友关天培，在培妹佩佩的侦查下，才洗脱天培嫌疑。原来日父之死，是董家帮首领董一峰及其得力助手马群所为。群乃日军卧底，利用峰而挑起上海各帮会互相仇杀。 日之爱侣余婷遭马群绑架，利用婷祖父的医院做细菌实验，欲以此吞并中国。日在连番追查下，察觉到婷行为有异，日至此才发觉到，他所面对的是一项国际大阴谋。。In the town of Thiers, summer of 1976, teachers and parents give their children skills, love, and attention. A teacher has his first child, a single mother hopes to meet Mr. Right, another mom reaches out to Patrick, a motherless lad who is just discovering the opposite sex. Patrick befriends Julien, a new student who lives in poverty with his mother and has a terrible secret. Bruno shows his friends how to chat up girls. Sylvie stages a witty protest against her parents. Brothers give a friend a haircut. A toddler falls from a window and is unhurt. Everybody goes to the cinema. At camp, Martine catches Patrick's eye. A teacher explains: "Life is hard, but it's wonderful.。