MTL - Marvel: I, Created the Masked Foundation X - Chapter 34

Lu Wu, an aimless video game developer, had been feeling perturbed ever since he found out he was the direct descendant of a king from the underworld. Other than the title, His Excellency, his ancestor hadn’t passed down anything else to him. On top of that, all of his ancestor’s subordinates had rebelled against him and completely usurped his inherited territory.

Grace Lightsinger is just a simple farm girl.Ever since the death of her parents, she's been taking this slowly, one day at a time. That changes when she dies protecting a stranger. But instead of a peaceful afterlife, she finds herself reborn as an angel with a mysterious “Saintess System” that no one else can see. She's made to choose between three factions of gorgeous immortals: warrior angels who fight demons, healer angels who tend the wounded, and love angels who raise morale through very intriguing methods.However, unlike other angels who can only master one path, Grace discovers she has an affinity for all three. This hasn't happened since the goddess Eternia herself walked the heavens, which leads to Grace learning that she might be more than just a regular angel. She might be Eternia's chosen successor, herself.But not everyone in heaven is happy about Grace's arrival. The scholarly Choir questions her legitimacy, fallen angels show dangerous interest, and that's not to even begin talking about the demons she'll be fighting.Grace wanted a peaceful afterlife, but between training, fighting demons, and trying not to die of gay panic, she's about to discover that heaven is a lot more dangerous than she ever imagined.

When I was reborn in South Korea, I wanted to live my life in peace. Pass the activation system, unlock the 'Big Brother' career, obtain the invincible system, and embark on the road to power

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.