The Book-Traveler and the Frail Demon King

The book says that Yan Mingshun turned from the righteous path to demonic cultivation and single-handedly wiped out three thousand sects in the human realm, ruthless and cruel.

The book says that Yan Mingshun united the Twelve Demon Palaces. Those who obeyed lived, and those who resisted died. He was cold and merciless.

The book says that Yan Mingshun eventually killed the protagonist and destroyed the world...

Qing Kui transmigrates, only to discover that this Demon King seems a little off.

He coughs after walking three steps, pants after practicing the sword once, and even gets short of breath from talking too much.

Everyone in the righteous sects is constantly worried about him, afraid he'll suddenly drop dead one day.

Hey! What happened to that tyrannical aura of a king who could kill gods and demons?

As a cannon-fodder villainess who was strangled to death by the Demon King in the original book, Qing Kui instead finds him gripping her wrist and imploring her,