Lin Mu, a multi-billionaire business tycoon, accidentally transmigrates into the Great Qian Dynasty and becomes a live-in son-in-law of the Su family. At his wit's end, an exclusive counterattack system abruptly awakens. Armed with his past-life commercial experience and system assistance, Lin Mu resolves to establish a firm foothold in this otherworldly realm. However, his opening days are fraught with setbacks. On his very first day after transmigration, he is ambushed and falls unconscious, but by a twist of fate, receives an imperial decree to marry the Eighth Princess, Li Yueci. From then on, stepping into complex court rivalries, Lin Mu resets his development direction, assists the princess with cross-era foresight, and resolves all kinds of courtly power struggles step by step.