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朱蘭早與富家子徐堅(jiān)白（張揚(yáng)）相戀朱蘭自幼父母雙亡由叔嬸養(yǎng)大但叔嬸卻因貪財(cái)而將她許配予同村的軍人李志忠（朱牧）堅(jiān)白在外地求學(xué)假期回鄉(xiāng)與蘭每晚相聚被人發(fā)現(xiàn)李志忠的父母聞?dòng)?要求退婚叔父（吳家驤）怒摑蘭被志忠阻攔蘭感動(dòng)不已 　　秋明心儀堅(jiān)白主動(dòng)相邀晚飯后堅(jiān)白突感不適秋明將他接回家中靜養(yǎng)親侍湯藥堅(jiān)白對(duì)秋明好感油然而生蘭知悉秋明與堅(jiān)白同校同宿自慚形穢亮寫(xiě)信給他佯稱已自對(duì)象提出分手堅(jiān)白接信傷感不已轉(zhuǎn)移接受秋明愛(ài)意 　　堅(jiān)白因祖母（歐陽(yáng)莎菲）病逝回鄉(xiāng)奔喪弟弟堅(jiān)中（田青）告以實(shí)情堅(jiān)白對(duì)蘭愛(ài)念復(fù)熾相約私奔秋明到訪得悉二人的私奔計(jì)劃趕往勸阻蘭卻發(fā)現(xiàn)蘭原來(lái)肺病纏身但蘭不忍連累堅(jiān)白終于打消私奔之念蘭與明一夕長(zhǎng)談竟成知己 　　堅(jiān)白意冷心灰黯然北上投考大學(xué)途中結(jié)識(shí)爽朗熱情的少女蘇亞南（葉楓...