Xia Xin, an abandoned disciple of the Dao Sect, was punished to face the wall at Sihe Cliff for three years, but due to the sign-in system's ten-thousand-fold critical hit, he obtained the Hongmeng Sword Body, took the pseudonym Xia Jiuxiao to go down the mountain, destroyed the Blood Nether Sect with a single sword, took a girl with phoenix bloodline as a disciple, was enfeoffed as the Prince of Great Xia, and became an peerless sword god feared by tens of thousands. Yet back at the Prince's Mansion, he is just an ordinary son-in-law, living a plain life with his wife Ji Ruier. No one knows that his gentle and virtuous wife is actually the demonic path empress who rules the Heavenly Demon Sect—the couple each harbor hidden identities, mutually pretending to be weak, both afraid that exposing their true selves would scare the other.