I'm Really Not The Devil King

Zhang Heng awakens in a mysterious cavern, surrounded by horned figures meditating in eerie green light.   Realizing he’s somehow crossed into a demon world, his astonishment grows when he touches his own head and finds horns sprouting.  
As the “half-demon” Zhang Heng, he faces an elder’s grim decree: demons, hunted by humans, must infiltrate the Valiantheart Academy disguised as humans to ensure their survival. But survival requires drinking the lethal Devil Devouring Soup, a concoction that could either grant a human disguise or claim his life.     
Now, Zhang Heng stands at the academy’s gates, grappling with a haunting question—will he be humanity’s shield, or its downfall?