When modern detective Jiang Han chases a serial killer and falls off a cliff, he opens his eyes again and becomes the foolish son-in-law of the Su family, the richest man in Jiangnan. The poisonous wine on his wedding night failed to kill him, but it unexpectedly started his path of revenge - it turned out that this "idiot" was actually the orphan of the Marquis of Zhenbei whose family was exterminated fifteen years ago! During the day, he is a useless son-in-law that everyone despises, secretly practicing the incomplete "Xuan Tian Bao Jian"; at night, he transforms into a "ghost-faced Rakshasa" to eliminate bullies, and repeatedly solves strange cases with his criminal investigation reasoning ability. The black iron cigarette stick, which can be disassembled into a judge's pen, hides his most ferocious murderous intention towards his enemies.
