Lust System: Harem In Two Different Timelines - Chapter 5: Lena Seeks Help

Seo-jun was your average college student until a fatal vehicle accident took away his life. He found himself waking up in the body of Adrien Mallorne, the youngest son of a Count. Armed with his modern-day knowledge, he navigates through the new world he finds himself in. But why is the second prince following him around and blatantly flirting with him?_______A long arm that looked muscular, even with it being fully clothed, reached out above him. “Is this the one you want?” A familiar voice asked, sending shivers down Adrien's spine.It's the guy from the bookstore!Adrien nodded his head to answer the guy's question, forgetting that he probably wasn't in the best of position to be seen. “Ye-yeah.”Long, thick fingers wrapped around the spine of the book, swiftly pulling it down from the top shelf. “Understanding Economics?” The guy read the title out loud. “Mr. James' class?”“Yes.”The guy, who was standing close to Adrien, basically caging him in between his chest and the bookcase, handed him the book. The guy then reached up one more time and grabbed a green-colored book. “I suggest reading this one if you haven't taken the assessment yet.”Adrien took the book from him. “Thank you.”A deep voice rumbled from behind him as the guy laughed. He then took a step back, releasing Adrien from his confinement. “Try that again, but to my face this time.”

Transported to the chaotic era of warlord conflicts, Xu Guang is displaced and ends up begging.By chance, he lands a job in a rich family, responsible for taming the mammoth.[Name: Xu Guang][Current Job: 1. Beggar Lv5 (50/600). 2. Elephant Envoy Lv0 (50/100)][Professional Talent (Elephant Envoy): Enchantment (When you form a bond with your closest Giant Elephant partner, you will receive the elephant's favor and your strength will be amplified by the Giant Elephant)]

Because of his own carelessness, Duanmuhuai crossed into the world of the game “Xinghai OL”. Starting from a small core cabin, Duanmuhuai crossed the galaxy, traveled to countless worlds, awakened the power that had long been dormant, and fought against the hidden depths of the universe. The threat to dominate the galaxy!

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- Description from novelbuddy

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.