Mocked as a Worthless Son-in-Law, He Uses Modern Knowledge to Amaze the Crown

【Dragon Slayer Gambit】 A modern history master's student suddenly awakens in an alternate New Lusitania, where survival leaves him with one choice: become the son-in-law of a powerful family while hiding the truth about his time-traveling identity. As his new family pursues ambitious plans to build businesses and expand its influence, he begins to see dangers they cannot. With his knowledge of history and sharp instincts, the mysterious newcomer repeatedly helps the family avoid disaster and solve seemingly impossible problems. But when a royal decree finally arrives, the family's plans—and his carefully guarded secret—are pushed toward an unavoidable crisis. Can he protect the people who now depend on him without revealing who he truly is? Subscribe to Vow Short Dramas for more gripping historical twists, hidden identities, family intrigue, and unforgettable short drama stories. Like this video and stay tuned for more exciting episodes! ✨ #VowShortDramas #ShortDrama #DramaSeries #HistoricalDrama #TimeTravel #HiddenIdentity #ArrangedMarriage #FamilyAmbition #RoyalDecree #EnglishDrama #EnglishSubtitles #InternationalDrama #DailyEpisodes #BingeWatch #QualityStorytelling