Why Is This Immortal Lord Qing a Demon?

The flying bird has a good bow, and the supreme immortal Ji Wangchen was killed. When he woke up, he found that he had taken his body and was reborn as the final enemy who was destroyed by his own hands, the demon king Qu Youming. Since all the immortal families failed me in the last life, in this life I will take revenge on the gods as a demon king, take charge of the underworld, and unify the immortals and demons.