Honghuang: You Asked Me to Manage the Underworld, and Everyone Became a Saint

Lin Feng transmigrates to the Primordial World and obtains the [God-Tier Teaching] System. With the War Between the Liches imminent, the Ten Suns in the sky, and humanity facing extinction, Houtu leaves Lin Feng to deal with the mess. When Houtu returns to the Underworld, she is stunned. Fengdu the Great declares, "I am the Heavenly Emperor. I shall suppress every enemy in the world! Six Paths Reincarnation Fist, break!" Jiufeng cries, "I, Jiufeng, have never been inferior to anyone! Great Void Art, open!" Yama proclaims, "Who stands at the peak at the end of the immortal path? Once you see Yama, the Dao vanishes into emptiness!" Hou Yi roars, "Taishang, your life is mine!!!" Houtu is dumbfounded. What is going on? Why are they all so powerful? Do they all have the potential to become Sages?! And what happened to humanity? Why has the entire race ascended to immortality? Lin Feng pauses, then asks, "Hey, want to learn the Grotto-Heaven method?"