唐(táng )朝太宗年间，某夜(yè )唐太宗梦见身陷险(xiǎn )境，幸得(😘)一白衣(🛍)少年所救(jiù )(🤴)。徐茂公解(jiě )梦，显示将(🌰)有乱事，须得该少(😧)年相助平乱。太宗(zōng )命张士贵(📼)往找(🚤)应梦少(🐿)年。原(👑)来此应(yīng )梦贤臣乃(🕯)大(dà )将军程(chéng )咬金之救命(mìng )(🏐)恩人(rén )薛(xuē )仁贵(guì )，仁贵带(🗑)着(😚)咬金所赠之令箭(🚑)投军，期间更误堕地(dì )洞(⏺)而得奇(qí )遇(yù )(🧚)…