I Can Accumulate Proficiency, Starting from Alchemy - Chapter 65 - : Collision

[1V1 easy read, a pampered romance] Time-traveled straight into a wedding, does it have to be this intense?“Hey, hold on, groom, I'm not your bride!”Su Pan'er fiercely resisted.Someone chuckled craftily, “Quit messing around, my dear wife!”This story is fantasy, don't compare it with actual historical context. Recommended another novel by Dou Dou: “Joy of Being a Mother in a Farmhouse”.

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.

Waifus, Mechs, Magic! Witness a mind-blowing ride of spell-slinging beauties, earth-shattering mech wars, and an arcane system so deep you’ll lose yourself in its brilliance! Empires crumble, celestials clash, and the birth of legends in the most explosive, heart-racing epic you'll ever read!Jack Squire, a professional debris collector in Earth's orbit, witnesses the unimaginable — the colossal magical sigil igniting the sky above his hometown, Germund. As communications fail and soon an apocalyptic light blasts skyward and splits the moon in half, horrifying chaos dawn.Determined to seek the truth, Jack must navigate a perilous descent into a war-torn planet, where arcane magic and advanced tech clash in a brutal conflict between two empires.Osten Empire with its arcane: Magic & Spells (Essence and Slot System)V.S.Dunkelheit Empire with their war armours: Armatus (Think mecha)In this gripping sci-fi and fantasy adventure, ~one of a kind! Jack's quest to uncover the truth behind the cataclysm and save what remains of his world leads him into the heart of a war that shall decide humanity’s fate.

In the spirit of love and in order to help his ex-boyfriends walk out from the shadow of heartbreak, every time before Ye Ming leaves after successfully completing each world’s romance mission, he will ‘kindly’ (ruthlessly) break up with with his boyfriend.

After transmigrating to N different worlds he had finally gained enough experience. At this time the system informed him that because the accumulation of his ex-boyfriend’s grievances had exceeded critical levels, leading to the failure of all his missions…. So he needs to return to each world to eliminate their grievances if he wants to complete his missions!

Ye Ming: This is an outcome I didn’t predict.

System: I tried to tell you before that if you did this you won’t have a good end.

The ex-boyfriends all laughing coldly: He He. That despicable scum that ran away after deceiving my feelings is finally back. This time don’t even think about running away!

Ye Ming: ……

System: Since you “zuo” yourself to death, even if you kneel you have to go to the end!

Ye Ming: Luckily I have a special “scum cleaning” technique ^_^

- Description from Novelupdates