唐德宗元年(👷),长安(ān )出现(xiàn )异象,道(dào )士预(🍩)言(yán )黑(hēi )蛟即将出(chū )世危害一方(fāng )(🤢)百姓,渔户(🎗)经(🎹)常用三畜(chù )(🛤)三禽(qín )祭(jì )拜,却(🐮)始(🥩)终没有换来(lái )安(ān )定(dìng )。这日河西(xī )(🏇)一户吕(😎)姓书生(shēng )((🐿)陈(chén )浩民饰)(🤷)得(🗄)到父亲应允,坐船东渡与(yǔ )白(bái )氏之(zhī )女白(bái )瑛(李萌萌饰)去退婚,这时(🖍)天(tiān )气突现异象险些造成船毁(🚢)人亡,惊险(xiǎn )之余到达白(bái )家(jiā )后却(🖲)发现(xiàn )白瑛父亲(qīn )在百花(🥎)楼失踪,此次东行接连失(🤠)利。百花楼内险象(xiàng )迭生,书生想(⛏)要逃离之际(jì ),却(🤲)遇到(⛳)了上仙(👺)太(⛳)白金星,被(🕐)告知自(🚴)己(🧣)是白鹤上(🌮)仙(xiān )转(zhuǎn )世,前世今生(shēng )黑(🏉)蛟都是书生必(bì )须经历的劫难(nán )(🏻)。