MTL - Start with Psychologist - Chapter 751

In the beginning, when they all thought that she was “he”….

ML #1: We will be brothers for life!

ML #2: This time I’ll reluctantly let you have the #1 seat.

ML #3: I will properly repay royal teacher!

ML #4: Ah Rong is my closest little brother, I trust him.

Afterwards…

MLs: I’m seriously such a fool.

MLs: What do I do, I think I’m gay. I fell in love with my bro/rival/teacher….

Afterwards….

MLs: I’m straight! As straight as steel!

Note:
MC is a girl crossdressing as a boy, she knows how to fight, and naturally possess the gold finger halo from the author.

All the ML(s) is the same person, 1v1, sc, HE

- Description from Novelupdates

Nan Yu was brought by the Nan Family back from the countryside to pretend as the fake heiress, being forced to marry the paralyzed and tyrannical young master of Huo Family on behalf of the real heiress.Before the marriage, she was just a fake heiress who had been abused since childhood, despised by everyone, and had nowhere to call home.After the marriage, she became the heiress who was coveted by many, lavished with love, and had countless brilliant hidden identities.Such a perfect person, the only pity was having a disabled husband.Everyone advised her to kick him out and find someone better.But a few days later, they saw the man who had been in a wheelchair stand up and become the rich and powerful ruler of the Huo Family.He then pinned Nan Yu in a corner, held her by the waist, and with a hint of red in his eyes, and said, “Sweetie, I heard that you want to divorce me?”Remembering his wildness in bed, Nan Yu shook her head violently, “No! Those are all rumors. You are the only one I want to spend my life with!”

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

- 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.