How did I, a mere son-in-law lying down, become a "Fenglang Juxu" (a legendary martial art

He transmigrated to a fictional world, becoming a lowly son-in-law. This son-in-law resigned himself to his fate, wanting only to fish, watch plays, and frequent brothels. However, he couldn't abandon his wife, neglect his father-in-law, or ignore the imperial court… So, the son-in-law began to exert himself, navigating the treacherous waters of the business world, navigating the complexities of court politics, and achieving great feats on the battlefield… Just like that, he transformed into his wife's capable husband, his father-in-law's favored son-in-law, the Empress's most favored minister, and… the godfather of a certain prince?