MTL - My Unrivalled Princess: I Won’t Mess With You - Chapter 467 unsolved puzzle

Lu Zixin has a Black Technology Chat Group of the Ten Thousand Realms , and the group members are the science and technology giants of the world.

Tony Stark : “Group owner, I will send this War Machine Mark II Armor to you!”

Red Queen : “Group owner, do you want to try the latest T virus ?”

Skynet : “Group owner, where is your world? I am going to destroy it.”

Bruce Wayne : “The Batmobile is simply used to pick up girls and today I have a great girl. Do you want to see it ?”

Vega Punk : “Recently synthesized a new demon fruit, does the group want to try an experiment ?”

Little Spidey : “I don’t care, I don’t care, do not send me the red envelope, I will retreat!”

. . .

Lu Zixin : “A group of lawless people, be careful with me!”

- 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.

Shuu is a member of the literary club that can’t write. One day, he gets a mysterious message on his phone from a girl called Eina, and from that impulsive contact, they begin to exchange messages. They talk of things like their shared interest in novels and grow close. However, when they try and meet, they discover a shocking truth. Eina lives… not in the present, but five years in the past! How will their love develop, parted by five years of nights…!?

Jiuling was once the daughter of the crown prince, the princess of a nation. She specialized in medicine and incredibly intelligent, and yet she was murdered. After her death, she actually ended up reincarnated into the body of a distressed orphan girl, Jun Zhenzhen. One of these days, Jiuling was going to go back to her killer and get revenge. However, she had urgent matters at hand that needed tending to, trouble of which was left to her by the previous owner of Jun Zhengzhen.

Jun Zhenzhen was a simple-minded person, an unruly and distressed orphan girl. She hoped to rely on the marriage that her grandfather had arranged and marry the perfect husband in the hearts of many women - the young master of the Ning family. However, the Ning family completely abandoned her and was unwilling to go through with their arranged marriage. Furious, Jun Zhenzhen wanted to pretend to hang herself, but she ended up really dying. Thus, arrived Jiuling.

Having taken Jun Zhenzhen's body, Jiuling quick-wittedly resolved the difficult situation and saved the Ning family from embarrassment and also stood up for herself. Unfortunately, this little feat was just the first step on her long road to accomplishing her revenge...

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