The Demon King Can Only Act

I traveled through time and became the devil of this world! The Demon King with supreme magical power... Why does it feel like there is no change from before time travel? An illusion, yes, it must be an illusion. Escape, you must escape, if you are discovered, the game will be over! Seeing the fire-breathing dragon hovering in the sky outside the window and being guided by a great sense of survival. "Cough, cough, hum, I am Demon King Beliat!!!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.