My Ancestral Grave Is Smoking Green, and I've Caused Inflation in the Underworld

[Urban fantasy + fortune-telling] During the Qingming Festival, Su Lin returned to his hometown to pay respects to his great-grandfather. But he discovered he’d been paying respects at the wrong grave!? After being swindled out of five trillion, the neighboring great-grandfather’s ancestral grave angrily belched smoke, and a door to a whole new world opened. When Su Lin actually arrived in the underworld, he was astonished to find that it hadn’t suffered inflation despite people in the human world burning money on a massive scale. In fact, it was terribly poor!? With the ability to freely travel to and from the underworld, Su Lin began hatching a little plan of his own... Several years later... The underworld was hit by inflation, and the King of Hell ran off with his sister-in-law.