Crossover: Who Says a Killer Can't Transform?

[Sorry, everyone. I'm planning to start this story after finishing the one next door. I absolutely won't abandon it! If you're interested, you can add it to your collection.]

Blurb One:

First, let me introduce myself.

My name is San Muye Jin.

I'm a professional assassin. My current ability is to transmigrate through time and space at unpredictable intervals. Thanks to a certain white creature, I've also taken on a side job as a magical boy, a career that's terrible for my health.

Even though I've explained this to my previous boss many times, I still have to say it again.

I'm not a pervert. Killing people is my job, having fun is an occasional hobby, and transforming is a matter of survival. But in the worlds I've visited, plenty of people have misunderstood me. They called me a cross-dressing pervert who stabs all sorts of people while smiling (I killed them all), or a lunatic with so many buffs stacked up that he was practically flying.

But please believe me. Those were nothing but lies spread by those bastards to slander me. I'm an assassin with professional ethics and a craftsman's spirit. Apart from the unconventional practice of burying a client who skips out on payment together with their target, I've never done anything out of line... Haha, of course, skipping out on payment is the exception. I'm sure, sir, you wouldn't do anything to undermine the trust between us, either.

Ahem. I'll carry on, then. At your command, sir, I'll be your loyal shadow. I offer a complete service, from killing and disposing of the body to aftercare, and I absolutely won't expose any of your secrets. You can check my reviews from other worlds. They're all five-star ratings, guaranteed authentic.

The detective agency looked at the densely packed, blood-spattered five-star reviews and rejected him without a second thought.