Binding The Hell System

"Ding! The Host has bound the Hell System and become an Underworld Office member. Would you like to activate the system and start working?"
He was stunned! He was a young man of modern times and never believed in those supernatural things.
When his father called to inform him that his second uncle had passed away, he stayed in the mourning hall until midnight. Later, as he went for a rest, he dreamed that his Second Uncle was trying to get him a high-paying job. He muddle-headedly signed a job application with his guidance, leading to the following events nearly making him curse!
"System automatically activated. Suppose the Host does not comply, you will need to pay the penalty which will make you die."
He assumed his first mission would not be challenging based on its description, but he nearly lost his life while completing it! He thought things might get better from here on out, but who knew that the worst was yet to come!?