Imagine waking up not in your bed, but on the precipice of history itself, clad in gleaming, anachronistic armor. That's the reality for Liu Mang, a cosplayer hurled back to the chaotic Eastern Han Dynasty in *My Father in Law is Lu Bu*. Talk about a wardrobe malfunction! Suddenly finding himself atop XiaPi's crumbling walls, moments before its fall to Cao Cao, Liu Mang's desperate pleas of innocence somehow land him in the good graces of the infamous Lu Bu. In a twist of fate, he inadvertently saves the mighty warrior from betrayal and finds himself unexpectedly betrothed to Lu Bu's daughter. Now, this accidental time traveler is rewriting destiny. Picture this: legendary generals like Zhang Liao and Gao Shun, not in historical garb, but adorned in shimmering, custom-made golden armor. Envision Lu Bu's armies armed with mechanical crossbows, his lands flourishing with advanced agricultural techniques centuries ahead of their time. As Liu Mang's modern knowledge collides with ancient warfare, a new era dawns. But can one cosplayer truly prepare for the treacherous politics and brutal battles of the Three Kingdoms? Will his inventions secure Lu Bu's reign, or will they attract unwanted attention from ambitious warlords? Discover a thrilling alternate history where the past is rewritten, and a world under Lu Bu's banner is forged in fire and innovation.