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隋將楊越率兵征陳，陳後主殉難身死；為斬草除根更殺戮皇親並把宗卷焚燒。後主妹樂昌公主與駙馬徐德言短計思量，由駙馬改扮成幕府中人把宗卷送往梁國，嬰孩由太傅顧存義暗渡陳倉救離宮中，自己則留宮中應付楊越，並約以菱花鏡作日後相認信物。楊越得知眼前人乃樂昌公主，心生佩服憐憫，願保存樂昌性命，把樂昌母子認作妻兒。
轉眼九年，昔日嬰孩已長成總角小孩，楊小德對自己身世有所懷疑。顧存義在市集經營長安鏡鋪，時徐德言收買舊鏡，於市集遇上楊小德，始獲妻兒音訊欲把破鏡重圓。樂昌公主與駙馬雖眷念往日結髮之情，但往事已矣，欲挽已難。楊越得知駙馬尚在人間欲仗義還妻。樂昌在楊越與駙馬之間感左右為難，惟有以死殉身酬答二人濃情厚義。
The Ten-Year Dream
General Yang Yue of the SuiDynasty leads his troops against the state of Chen and kills the king during the battle. Tradition demands the ritual extermination of the royal family, with the execution of the family members and the burning of their genealogy. The king’s sister, Princess Lechang, devises a plan with her husband, Xu Deyan,for the survival of the lineage. Disguising himself as a staff officer, the husband dispatches a copy of the genealogy to Liang while Minister Gu Cunyi smuggles their baby out of the palace. The princess and her husband each take one half of a mirror as a token of their future reunion. The husband departs, and the princess stays on to confront theexecutioner. Learning that the woman in front of him is Princess Lechang, Yang Yue is filled with admiration and pity. He decides to preserve the lineage by taking Lechang as his wife and adopting her child.
Nine years hence, the smuggled infant becomes Yang Xiaode, a boy who harbors doubts about his parentage. Gu Cunyi now runs a mirror shop in the market of Chang’an. While at the market purchasing old mirrors, Xu Deyan meets Yang Xiaode, and, learning about his wife and son, decides to reunite with them. Although still reminiscent of the days when they were a couple, the princess and her ex-husband find it hard to rekindle their love because of the changed circumstances. Learning that her ex-husband is still alive,Yang Yue offers to abdicate. Torn between the two men she loves, Lechang chooses suicide.