MTL - The Rise of Space Technology - Chapter 2 , the inheritance of civilization of God

In a world where Heroes are the last line of defence against threats, 17 year-old Zane Skylark, was the most powerful of them all—a symbol of strength and justice. Known as the “Rank-1 Hero, [Hope].”[Hope's] every move was praised by the masses, and his victories were legendary.But during a mission, [Hope] is believed to have died, but only to survive due to an unknown skill—[Immortality].For 60 long days, Zane's lifeless body remains inactive, as the [Hero Association] declares him dead and appoints a new hero who can mimic Zane’s strength under his hero name [Hope].After resurrected.“What's... Happening?”“Didn't I... Die?..”“Immortality?”Zane finds himself in a confused situation.“After everything I did for them...”After finding [Hero Association] betrayal, he decided to distance himself from them.“It's been... almost 3 years. ”“Maybe I should return home.”He decided to return to his hometown, hoping to bury his past and lead a peaceful existence.But... can a hero truly abandon their destiny? Or will new challenges will force Zane to confront his past self and the responsibilities he has left behind?

This novel is also known as Phoenix Cry Firmament

The previous owner of Mu Ru Yue’s body had been poisoned. Because of this, her meridians were blocked, hindering her cultivation, which eventually led to her being known as trash. After being beaten to death, Mu Ru Yue, who had originally been a successor to a medicinal aristocratic family in Hua Xia, reincarnated into her new body.

They want to seal my path?

I will train to reach the peak of the realms!

They give me a foolish prince as my husband?

I can make do with him.

It would be easier for me to deal with him, rather than with other candidates who would be thrown at me in the future. I shall strive to become powerful enough that nobody will be able to mock or kill me!

- Description from novelupdates

The strongest Demon Lord dies, and reincarnates as a human. Not only that, he because of various incidents turns into the hero’s best friend.

Follow his journey as he tries to help the hero escape his fate, and on the sideline to conquer the continent while he’s at it.

“Marry me under the conditions that we will divorce in 5 years.”