I Secretly Develop Myself In The Demon World - Chapter 831 - 434 Time Demon God

Everything was over. Everything had stopped.The clanking, the rattling.Even if I seemed lifeless, I still had a life.Crackle! Snap! Crack!I failed to protect Lady Succubus. I failed to defend the dungeon. I was shattered into pieces, completely destroyed.[Succession Complete!]“Succession…? Assimilation…?”Broken and broken again. With each downfall, the world’s true nature begins to reveal itself.

Ren Zhouyuan, who loves to study Chinese culture since childhood, has never imagined that his own life would one day be subverted by a foreigner.

Not only do these foreign devils not love the Chinese, but they also scoff at him, looking at his eyes like watching a fool.

After getting drunk, Ren Zhouyuan is for no reason pregnant with a ball, and actually gave birth to a child as a man. This kid is blonde; almost do not have to verify who he is from the “handwriting.”

Ren Zhouyuan does not want to make that arrogant foreigner part of his life, but after fate tied them tightly together again, he found that there was a big difference between this man and the arrogant fighting nationality he imagined.

Leonid: Honey, what does ” Jijiwai Wai*” mean?
Ren Zhouyuan: Refers to people like you
Leonid: But I’m not chirping ah …

- Description from Novelupdates

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic.

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.