朱兰早与富家子徐坚白（张扬）相恋。朱兰自幼父母双亡，由叔婶养大，但叔婶却因贪财而将她许配予同村的军人李志忠（朱牧）。坚白在外地求学，假期回乡与兰每晚相聚，被人发现，李志忠的父母闻讯，要求退婚，叔父（吴家骧）怒掴兰，被志忠阻拦，兰感动不已。
秋明心仪坚白，主动相邀。晚饭后坚白突感不适，秋明将他接回家中静养，亲侍汤药，坚白对秋明好感油然而生。兰知悉秋明与坚白同校同宿，自惭形秽。亮写信给他，佯称已自对象，提出分手。坚白接信，伤感不已，转移接受秋明爱意。
坚白因祖母（欧阳莎菲）病逝，回乡奔丧。弟弟坚中（田青）告...
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