Modern office worker Kang Jin-woo possesses the body of a fallen scholar and takes the twin sisters So Ye-eun and So Da-eun as his wives. Awakening a Lover System that makes him stronger the better he treats his wives, he reforms the original body owner's brutal behavior and annihilates the village villains and bandit gang with firearms. Along the way, he meets the undercover investigator and ruler Song Eun-seol, pacifies the bandits' lair, and becomes betrothed to her. He then enters the imperial capital and saves the Empress Dowager with modern medicine. Next, he sees through the schemes of envoys from the Qinglang and Menghu kingdoms and helps the Empress defeat the regent king Jeong An-hun. Finally, Kang Jin-woo rejects the Empress and lives freely, enjoying life with his wives.