A Supervillain's System, A Superhero's Me

[Due to recent developments related to the original work, I've changed the premise. Thank you so much for your interest. Feel free to read or skip it, and I'm truly sorry!]

Kexia Gray, twenty years old, is working as a superhero.

At this moment, he's facing Batman, passionately arguing that Gotham vigilantes should stay out of Metropolis's business.

[Ding! You are now bound to the Supervillain Rehabilitation System. Follow the System's instructions, complete your missions, and return to a normal life!]

Kexia: ? What do you mean, rehabilitation system? Look at me and say that again!

I'm a vigilante! A superhero! A bona fide Metropolis native!

"Unbind the System."

[Because your mental state and intellect are far below average, the System has activated protective measures. Unbinding is temporarily unavailable.]

Kexia: ? What?

"What makes you think my intellect is below average?"

[Checking your condition and personal history...]

[The following experiences indicate an abnormal mental state and below-average intellect.]

[Age ten: You were born.]

"System, do you even hear the nonsense coming out of your mouth?!"

[Luthor illegally obtained Superman's DNA and created you, but lost you in an accident.]

[You ended up in Gotham. With too little sunlight and inadequate nutrition, your brain failed to develop properly, resulting in low intelligence.]

"I've been going to school in Metropolis this whole time! I get sunlight every day!"

[Age fifteen: You encountered the Joker. At the brink of death, you awakened your Kryptonian powers, but also contracted the Joker's toxin, causing your abnormal mental state.]

"I've spent twenty years in the sun and never awakened a single Kryptonian power! And I have never, ever met the Joker!"

Kexia was about to lose his mind. He really was about to lose his mind, but this System kept calling him an idiot, and he couldn't disconnect it or even turn it off.

Maybe he'd better go home and ask Clark for help...

[Age twenty, or now: With your low intelligence, you were tricked into joining the Legion of Doom and accidentally discovered your father's secret.]

Kexia was speechless.

Right, right. Clark was Superman. He'd known that for ages...

[It turns out Superman is Batman, Bruce Wayne, who was adopted by the Waynes years ago. He has been traveling between Metropolis and Gotham, playing both roles all along.]

[At this moment, he has discovered Lex Luthor's scheme, which will plunge Metropolis into a major crisis. But as he hurried into Metropolis, you stopped him.]

Wait?

Wait, what?!

Superman is Batman?

Stunned, Kexia listened to the System and slowly looked at Batman across from him.

Now that he thought about it, Batman's build and posture looked... exactly like Clark's...

Batman had just listened to his speech about how Gotham vigilantes should stay out of Metropolis's business. He fell silent for a moment, then said, "Metropolis is facing a crisis. Lex Luthor..."

Kexia abruptly stepped back.

Batman watched him.

[Newbie mission: You've met your father, and you can help him. This is a once-in-a-lifetime opportunity! Call him Daddy and kindly escort him to Lex Luthor's secret base!]

[Keep it up! The hope of restoring your intelligence and joining the superhero team is right before you!]

Reading note:

Speeding Bullet: Superman/Batman. Superman = Batman. Please consider all other details my own headcanon.

Theme: Treasure the present and love life.