The Underworld God's Apprenticeship with Black Impermanence

Hei Wuchang, one of the ten marshals of the underworld, actually got into a fight with the twelve-winged archangel of the West over a peach and was seriously injured, requiring him to rest for a hundred years. However, the underworld is busy with official affairs, and the top ten shady commanders are indispensable. The underworld held a grand meeting and announced that it would select a trainee, Hei Wuchang. No, our protagonist will appear now.