Underworld Upheaval: I Scared the Ten Kings of Hell to Tears

(System + no female lead + showing off + imagination-fueling + investigation + comedy + absurdity) A massive counterattack erupts in the Underworld, and King Qin Guang, chief of the Ten Yama Kings, begs an immortal to put down the rebellion. No matter what, he has to get Zhang Chen to help. Zhang Chen: “I really don't know how...” King Qin Guang: “Three million ghost coins, paid in full, plus a mansion and the Netherworld King's token. That's my final offer. I beg you, Immortal, please stop putting this off...” King Yama: “The Director has come from far away. I should be treating you well. Why are you investigating me instead?” Bank of Heaven and Earth: “I've heard of people being afraid of ghosts, but never of ghosts being afraid of people!” Xiang Yu: “Brother Lu Bu, if we join forces, we'll surely drive the evil spirits out of the Netherworld...” The day everyone learns that Zhang Chen is the Director of the Inspection Bureau, Meng Po cries in panic, the Judge takes to his bed, and Ox-Head and Horse-Face tremble with fear... As Zhang Chen uncovers one mastermind after another, the real boss finally appears, and a war involving demons, immortals, humans, and devils is about to erupt... Just when everyone thinks Zhang Chen is human, they discover he's an immortal. When they think he's an immortal, they discover he's a monster. And when they think he's a monster, they discover he's a spirit... (This story is entirely fictional. Any resemblance to actual events is purely coincidental. Please don't take it seriously or imitate it.)