Disguised as a demon lord

Chen Luoyang transmigrated and found himself taking over the body of the most powerful person in this world, the master of the Demonic Sect known as the "Demon Lord." But he was badly hurt, and surrounded by powerful beings, so he had to pretend he to be nonchalant and healthy, even though he was panicking inside. In order to survive in this world full of powerful and vengeful enemies, Chen Luoyang will have to do his best acting job continue pretending to be the almighty Demon Lord.

(Source: Kuaikan, translated)