MTL - Garbage Skills Become the Strongest In the Ninja World - Chapter 451 Count what I owe Doflamingo

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.

In a twist of fate, Jun Hao, a ruthless street thug known for his brute strength and sharp instincts, dies at the hand of the boss he served like a slave.

When he thought he would die, he saw a screen flash before his eyes—it was a system and a status window!

[System integrating: Become A Top Idol]

Jun Hao finds himself abruptly transported into the body of Choi Joon-ho, a timid trainee hoping to make it big in the cutthroat world of idols through “Rising Stars,” a highly popular idol survival show. In a world unfamiliar to him, where singing, dancing, and charisma reign supreme, Jun Hao must navigate the treacherous waters of an idol survival show or risk losing the life of his beloved younger sister.

……………………………………………………………

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“Live the life you want this time.”

A peerless assassin, codename: Hua, has already started her career ever since she was a child. Her mission’s record was perfect and whoever deemed to be her enemies would end up dead without knowing why.

When war ended, she was sent to an institution where she was watched heavily. The doctor in charge gave her an ordinary wuxia novel to read.

An avalanche struck after she had finished reading.

When she woke up, she had turned into Nan Hua, the young miss

In the general’s house, the eldest daughter is born again.