Temporary Worker in the Underworld, Managed to Be Number One in the Three Realms

I died suddenly after staying up late and became a temporary worker in the underworld's banknote sorting department. The job is to sort out the underworld coins. And I secretly bound the "Yin Chao Yun Ling System". Broken Hades Coin? Refined into cultivation. A special gift from the gods? Take a breath of top-notch virtue. I stayed in the deepest corner of the underworld, practicing with pay, picking up mistakes and becoming stronger. They laughed at me for being useless, and I laughed at them for not being able to see through it. Until the demon king crushed the underworld, hundreds of thousands of Yin soldiers collapsed, and Yama shed blood. The temporary worker who had been hiding in the corner counting money sighed and put down his account book. "If you fight until the end, do you still want to take action?"