The Laws of Cultivation: Qi = MC^2 - Chapter 28: Improvements

Ever since He Mulan, a 28 year old forensic investigator, transmigrated into the post-army civilian Hua Mulan’s body, she’s been under a lot of pressure. Unlike the folktale ending, there are no flowers or applause to be found here. After leaving the army and returning to her hometown, word by the countryside has painted the now 32 year old Hua Mulan as a homicidal maniac, an old hag, and a freak of nature, among other nasty things. Between piecing together Hua Mulan’s scattered memories, grappling with her fellow villagers’ prejudice against her, and fending off Mrs Hua’s attempts to match make her, He Mulan has her hands full. All He Mulan wants to do is protect Hua Mulan’s body till her soul comes back, but fate has other plans…

- Description from Novelupdates

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.

Shen Gu, an ordinary university student who discovers that he is a “spare tire” in his social circle.With the help of a system, he gradually rises to the top of life!

As a successful author, Max was used to hate comments but he never expected that his decision to kill an important character would result in his death.Apparently, the Goddess and her brother used to read his novels and were both a big fan of his works. Sadly, the brother didn't like his decision and killed him.As compensation, the goddess decided to send Max in his own novel as the protagonist and complete the story without letting any of the main characters die.Max had no problem with that, so he accepted it and asked for something else too.“Can I court you?”Now, he has the Goddess accompanying him as the Ultimate Leveling System. Not only that, his system also rewards if he saved the favourite characters of his novel. What could be better than this life?[You have Killed the Giant Behemoth Dragon, granted 200000 EXP.][You have saved the side character, Charlotte Sinclair, granted the fortune worth Corelhelm Kingdom.]Watch as how the author makes the harem of his favourite characters while leveling Endlessly....What to expect-Leveling+Mana Cultivation+Labyrinth adventures-OP MC-Light Hearted, Low stakes-A proper Harem and good romance-Very less Smut (yeah, the number of those chapters will be very low as I intend to focus on relationships, adventures and of course Labyrinth stuff.