As the Minor Gay Love Rival in Het Novels - Chapter 2.3

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.

Doomsday was approaching…

An ancient virus was released upon the world and from then on nothing was the same…

Zombies, mutant wild animals and people with mutant powers…

Jiang Liushi , one day woke up and found the Starseed in his mind, a Black Technology which could assist him in various ways.

Its most important function? Refitting and upgrading vehicles!

- Description from Novelupdates

Kyle woke up in a land of fantasy and magitech. The usual 'I died and woke up' bullshit, skip all that.

Except he used to be a crime lord, and society here is missing that extra kick.

Venshiro, a young ronin bound to the Black Vein Blade, is hunted by clans who would kill for the curse he carries. Every time he draws the sword, it takes something from him—his memories, his soul. But the blade remembers everything.And now, it wants more.