Who Could Be a Better Undercover Agent Than Me!?

Beiyuan Lin is a genius at combat and marksmanship with an extraordinary memory. The Public Security Bureau sends him undercover in the Black Organization. He spends ten years undercover, partnered with Gin, without ever being discovered. His acting is unparalleled, and he even saves the Public Security Bureau's undercover agent, Scotch.

During a mission in Britain, another undercover agent betrays him, and the enemy organization hunts him down. He takes APTX 4869 but doesn't die. Instead, he shrinks from twenty-nine to ten years old and is taken in by a man whose hair looks like it hasn't been washed in three days.

But can someone tell him why he, a reliable twenty-nine-year-old adult undercover agent, has still received a letter from Hogwarts?!

Wait a second. This is absurd. Isn't Hogwarts a magic school that only exists in novels? Isn't this supposed to be a world of science?!

To escape Gin's pursuit, Beiyuan Lin is forced to join the Hogwarts family.

Then he discovers that the man who took him in is none other than the famous Snape. (deadpan)

He owes Snape his life and has no way to repay him. After much thought, Beiyuan Lin makes the solemn decision to repay his life-saving kindness with a huge contribution.

He joins the Death Eaters as an undercover agent.

Beiyuan Lin: Now that I'm with the Death Eaters, Gin won't be able to kill me, right? :)

*

To go undercover, Beiyuan Lin argues his case to the Order of the Phoenix: "I'm really good at going undercover. Seriously, nobody's better at it than me!"

The Order of the Phoenix: "Sure, sure, you're right about everything, but don't even think about it."

Beiyuan Lin: "But I've already worked my way up to being Voldemort's top lieutenant."

The Order of the Phoenix: "?!"

*

"My code name is... Firewhisky."

"Japanese Public Security. Beiyuan Lin."

Beiyuan Lin fearlessly meets those wolf-green eyes and sneers. "Long time no see, Gin."

Gin is just about to pull out his Beretta when his partner, who has been missing for years, laughs and shouts, "Apparate!" Then, with a bang, he vanishes.

Gin: "There's a certain swear word I don't know whether I should say. :)"

Theme: Justice will always triumph over evil.