I, The Demon Lord of the Demon Realm, Found Out That My Wife is the Emperor of Heaven

Novel Summary
[Invincible start] Lin Tianhong traveled to the world of immortals and demons. From a mere mortal, he struggled for 10,000 years and became the demon master of the demon world who made the three worlds tremble.
The terrifying power made all beings in the Three Realms tremble.
In order to perfect his own way, he lived in seclusion in the Fengjing City of the Shenfeng Dynasty, and met his wife Li Xiyue.
An ordinary life, an ordinary self, and a gentle wife make him enjoy this ordinaryness very much.
He didn’t know that his wife was actually the Heavenly Emperor Xi and the Empress of the Immortal World who had been killed by him.
Both of them didn’t know each other’s identity and thought they were just ordinary people.
As a result, the Demon Lord of the Demon Realm and the Heavenly Emperor of the Immortal Realm, two mortal enemies, became husband and wife by chance, and started the story of falling in love with each other and having children.
“Since my wife wants to live in Fengjing City, whoever dares to disturb the peace of this city and destroy her peaceful life will kill them all.”
The terrifying Supreme Being of the Demon World instantly turned into a wife-protecting madman.
The world is big and the wife is the biggest.
“Whoever dares to be unfavorable to my husband, this emperor will let him destroy the clan and the family.”
The domineering Central Heavenly Emperor has also become a guardian madman.
Those who offend my husband will be punished even if they are far away.
– Description from readMTL