MTL - Marvel: Start with Summoning the Shadow Troopers - Chapter 60

Our straight (?) bottom woke up ten years into the future and found himself on the bed of his childhood friend… At the start, the bottom was shocked to his very bones, but he soon quickly accepted this premise and found the whole situation to be rather amusing. Precisely then, the bottom once again went back to his timeline — back to when he and the top were just platonic childhood friends.

“The harder I try to hate you, the deeper I fall for you.”

His presence irked her to the core, but whenever he got out of her sight, she missed him?!

….

A tyrant, known to be the city’s infamous playboy.

As an executive assistant, she was forced to work under him by the most cruel twist of fate.

If losing her job overnight was a nightmare, then working under a boss like Desmond Fort was hell. He was an arrogant narcissist with an ego bigger than the whole of Imperium city, but that was not what angered her the most.

The most infuriating fact was that despite his constant assholery, her heart seemed to stupidly skip a beat every time he gazed at her with those devilishly charming eyes.

She knew she was making a mistake but that didn't stop her from sinking deeper and deeper into his charm.

All she wanted now was to leave! But leaving hell was not nearly as easy as getting in.

A master assassin transmigrates into an interstellar era.

Other players were responsible for competing in the e-sports arena, while he was responsible for stringing up and beating up the other players.

His sword was hidden during the peak of day, and he was a gentleman who arrived in a flash of light;
As a vanguard of the eternal night, he was the variable between life and death in the world.

“As you know, the Star League’s difficulty levels are arranged in this way:
Paradise < Simple < Normal < Difficult < Nightmare < Hell < [Tyron Odin]”

- Description from Novelupdates

Cheng Xi, a guileless psychiatrist with a heart of gold, who would do anything for her patients. Lu Chenzhou, a frigid businessman who refuses treatment for his emotional detachment.