现代卑微的赘婿李佑（管云鹏 饰）来到大宁朝虚江县，子承父职当上衙役。小小衙役受人讥笑，李佑愤而赠诗，给同样受辱的歌姬李环（施予斐 饰），孰料名声大噪成为雅吏，更引来知县（李熹子 饰）赏识。青云路正在打开，没想到有才华的男孩子也很危险，李佑被武官刘巡检（徐锦江 饰）与富商关员外（严丰 饰）同时抢亲，阴差阳错成为两家赘婿。怎知换了时空依旧赘婿，而且升级为一婿二赘！好在李佑机智，定下三年之约，只是在刘心玉（余梦寒 饰）和关绣绣（宋霄瑛子 饰）的攻势下左右为难。为了自由，李佑努力上进，在文坛声名鹊起被誉为江南词圣，在县衙屡破奇案步步高升，在商场点石成金。他的正义感更令他不畏豪绅严家和县丞等黑恶势力，为民请命，名动朝野。却不想，他变得越来越耀眼，关刘两家也不约而同，越发难以放手这个乘龙赘婿。这一场三年之约，究竟如何了局

現代卑微的贅婿李佑（管雲鵬 飾）來到大寧朝虛江縣，子承父職當上衙役。小小衙役受人譏笑，李佑憤而贈詩，給同樣受辱的歌姬李環（施予斐 飾），孰料名聲大噪成為雅吏，更引來知縣（李熹子 飾）賞識。青雲路正在打開，沒想到有才華的男孩子也很危險，李佑被武官劉巡檢（徐錦江 飾）與富商關員外（嚴豐 飾）同時搶親，陰差陽錯成為兩家贅婿。怎知換了時空依舊贅婿，而且升級為一婿二贅！好在李佑機智，定下三年之約，只是在劉心玉（余夢寒 飾）和關繡繡（宋霄瑛子 飾）的攻勢下左右為難。為了自由，李佑努力上進，在文壇聲名鵲起被譽為江南詞聖，在縣衙屢破奇案步步高升，在商場點石成金。他的正義感更令他不畏豪紳嚴家和縣丞等黑惡勢力，為民請命，名動朝野。卻不想，他變得越來越耀眼，關劉兩家也不約而同，越發難以放手這個乘龍贅婿。這一場三年之約，究竟如何了局？

In order to gain freedom, Li You worked hard and gained fame in the literary world, earning the title of the “Lyric Saint of Jiangnan.” He also steadily rose through the ranks in the county yamen, solving extraordinary cases, and achieved great success in the business world. His sense of justice made him fearless against the evil forces of the wealthy Yan family and the county prefect, and he became renowned for advocating for the people, gaining fame across the dynasty. However, he did not expect that he would become more and more dazzling, and both the Guan and Liu families found it increasingly difficult to let go of this exceptional son-in-law. How will this three-year agreement ultimately unfold?

현대에선 누구에게나 무시받던 리우는 과거로 타임슬립하여 관아의 하인이 된다. 관아들의 비웃음을 받던 리우는 문학적 재능을 발휘하여 사람들을 놀라게 하고, 무관과 거상의 집안에 눈에 들어 두 집의 데릴사위가 된다. 또한 리우는 여러 차례 기이한 사건을 해결하며 여야의 주목을 받게 되는데...