Soul Pact: Working for an Evil God to Pay Off My Debt

Office worker Charrion Zacarias suddenly transmigrates into a world of magic only to inherit a dying boy's staggering debt of billions! As if that weren't bad enough, the boy's failed attempt to summon the Dark God leaves Charrion bound by a soul contract which is to fulfill the Dark God's 999 wishes or face complete annihilation. His only hope is that mysterious talking notebook known as God's Notebook. A modern-day salaryman take on a ruthless, power-driven world, using workplace savvy, relentless hustle, and relentless training to defy fate. The servant of the Dark God refuses to give up!

(Source: WEBTOON)