The Common Sense Alteration App I Thought Was Spam

It was 1:45 a.m. Every light in the office had gone dark, and only my monitor still poured out its cold blue glow, carving a lonely island of light from the blackness.

"Ah… I really want to go home."

This was the third straight day of hellish overtime.

For an entire week I had been rewriting the proposal without a proper night's sleep, even nosebleeding from the strain, yet there was still no end in sight.

I rubbed my gritty eyes and let out a long, heavy sigh.

I wanted nothing more than to sprawl out on my own bed instead of freezing in this empty office.

If I could just get home, catch up on all the porn I'd been putting off, and blow a load until I felt empty, I wouldn't ask for anything else.

The moment I pictured the voluptuous bodies of my favorite porn actresses, something heavy and instinctive began to stir and rise between my legs.

Ah, I really just want to bust one out…

In the middle of that lewd fantasy, a woman's face suddenly flashed through my mind without warning.

My mentor, Assistant Manager Han Jieun.

She had long, silky straight hair that fell all the way to her waist, and a pale, alluring beauty that could slap most celebrities across the face.

But unlike that gorgeous exterior, Han Jieun was a venomous bitch of the highest order who seemed desperate to tear me apart.

That bitch… I really want to pin her down and fuck her like a dog.

She drove me insane with her constant nagging every single day, but honestly, her looks were the perfect match for my ideal type.

"Haa… What kind of face would she make if she were pinned under me, crying?"

"I just want to see that cold, haughty face of hers begging me to stop, just once."

"Then maybe this miserable feeling would all go away…"

The reason I was stuck here suffering through overtime was all because of that bitch's orders.

She had insisted the proposal had to be finished by this weekend, and every day she rejected it, saying it wasn't good enough, and ordered me to rewrite the whole thing.

Just thinking about what happened during the day still made me want to kick my blankets in pure shame.

"Seo Minwoo, you call this a proposal? If you have a brain, try using it for once when you work."

Han Jieun's sharp, cutting voice had echoed through the middle of the office.

"Or are you deliberately writing it like this to screw me over?!"

She had flung the entire stack of proposals I had stayed up all night making straight at my face.

The fluttering papers smacked into me and scattered pathetically across the floor.

It was a public execution in a space with dozens of employees watching.

I could feel the pitying gazes of my colleagues.

Those sympathetic looks that openly said they felt sorry for me.

Or the ones thinking, There goes that witch's hysteria again.

That's what you get for having the wrong mentor, they were surely clicking their tongues inside.

Those pitying stares only deepened my humiliation.

The moment I had to kneel down to pick up the papers from the floor, that sense of degradation flashed through my mind again, and my whole body trembled.

"Ah, fuck… I really don't want to live."

For a second, the impulse surged to just grab her by the hair and ram into her.

Or maybe write a post on the company board titled [Exposing Assistant Manager Han Jieun's Habitual ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Workplace Harassment] and just lie down and die.

Then I could completely bury that great career and life of hers.

But… in reality, I was a weakling who didn't even have the courage for that. It was so unfair.

I'm twenty-six. I've never even had a proper relationship, and I'm throwing away my youth on this shit…

I wanted to hold a perfectly beautiful woman in my arms like everyone else and spend a night so hot it melted my whole body.

"Haa, should I just go to the bathroom, think of that bitch's face, bust one out, and come back to rewrite it…"

Just as I was miserably sighing and about to reach for my pants—

Ding!

In the silent overtime office, the text message alert from the smartphone I had tossed on the desk rang out sharply.

"What? Who's texting at this hour?"

I flinched at the alarm echoing alone in the dark office and picked up my phone. When I turned on the screen, there was a text from an unknown number.

"Ugh, what the hell. It's just spam."

Normally I would have clicked my tongue and hit delete without a second thought.

But the title Common Sense Alteration App was so vulgar and blatant that it somehow snagged my attention.

It had a magnetic pull that made it impossible not to press.

I had just been fantasizing about pinning Han Jieun down and fucking her like a dog, so the timing was almost too perfect.

"Ah, whatever. Nothing to lose. Might as well try it."

Half out of curiosity, half out of pure resignation, I tapped the link.

The moment I did, it installed itself, and a strange icon appeared on my home screen—a pitch-black background with a single violet eye that shimmered unnaturally.

The app name was exactly as advertised.

Common Sense Alteration App

Once it was installed, a delayed sense of unease washed over me.

"Wait, this isn't some voice-phishing or hacking app, is it?"

The anxious thought lasted only a moment before I let out a hollow laugh.

Hell, even if they hacked ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠my phone and stripped my soul bare, there was nothing worth taking from this bottom-feeder life of mine.

"Go ahead and rob me if you want. What are they going to get from hacking a broke bastard with only a few tens of thousands of won left in his account?"

"The scammers would probably feel sorry for me and send me money."

With that whatever-the-hell attitude, I tapped the app.

A heavy thrum of vibration ran through the phone, and a translucent violet window filled the screen.

Beneath it, an empty input field blinked with a lonely cursor.

"…What the hell? No explanation? What am I supposed to do?"

"And wait… when did I ever type my name into this thing?"

I frowned at the unfriendly UI and scanned every corner of the screen until I spotted a tiny, sparkling question mark in the upper right. Was I supposed to press that?

When I tapped the question mark, the screen shifted and a brief manual appeared.

"That's it? What kind of half-assed explanation is this?"

Just write a name and picture a face? Even the shittiest mobile games these days wouldn't make a tutorial this pathetic.

Yeah, figures. It was obviously some cheap phishing bait.

But the humiliation and thirst for revenge from what Han Jieun had done to me during the day flared up again deep in my chest.

"Fine. I'll just pretend I'm getting scammed and try it once. Something's bound to happen."

As if possessed, I began typing that damn bitch's name into the blinking input field with trembling fingers.

I had entered the name, but I had no idea what to write next.

Should I just tell her to come here and strip right now?

Nah. It was obviously a fake app. No way it would actually work.

I let out a hollow laugh and was fiddling with the next field when—

Grrrrrk—

My clueless stomach twisted and growled loudly.

I had been working overtime all week and had completely skipped dinner again tonight.

"Ah, I'm so hungry I could die…"

The moment I clutched my stomach, Han Jieun's face—the same face that had thrown the proposal at me during the day—floated up in my mind.

"That evil bitch. Because of her I'm stuck here starving and suffering this late, while she probably clocked out free as a bird, ate something delicious, and is sleeping with her legs stretched out."

Remembering the root cause of my misery made irritation surge up my throat.

With a whatever-the-hell attitude, I typed my thoughts exactly as they were, half as a joke.

It was a fake app anyway. Nothing to lose.

I finished the sentence and, following the manual, vividly pictured Han Jieun's face in my mind once more.

In that instant, the smartphone screen flashed with a strange violet light.

"Whoa! What the hell was that?!"

I sucked in a startled breath and checked the phone, but that was the end of it.

The office was still silent. Nothing had happened.

The flashing screen soon returned to its usual darkness.

In the hollow quiet, I let out a dry, empty laugh.

"Seriously, what was I even expecting? Getting baited by an obvious phishing app. Nice job, Seo Minwoo."

Because I had ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠been picturing Jieun's face for so long, my pants were now so heavy they felt ready to burst.

It showed no sign of calming down, so I walked to the bathroom and locked the stall door behind me.

Standing in front of the toilet, I yanked my pants and underwear down in one motion. My blood-engorged weapon sprang free, fully erect and furious.

The second I wrapped my hand around the hot, hard pillar, Han Jieun's haughty face appeared vividly in my mind.

"Haa… I'm going crazy. What kind of sounds would she make if she were pinned under me, crying?"

"She'd be begging me to stop with tears and snot running down her face."

In my imagination I grabbed a fistful of her long hair and forced her to her knees in front of me.

Minwoo… please…

Tears welled in those once-arrogant eyes as Han Jieun looked up at my massive cock and trembled.

I roughly shoved myself between those cold, proud lips.

"Mmph, mmph…!"

The fantasy of mercilessly violating her small, pretty mouth with my thick shaft filled my head.

Even as she choked and gagged, she desperately rolled her tongue around my cock while watching my expression, and that image flooded every corner of my mind.

My hand pumped faster and faster.

The wet friction of skin and my ragged breathing echoed obscenely inside the narrow stall.

"Assistant Manager Jieun… if you're going to be an assistant manager, suck it deeper like one… ahh!"

The moment I imagined burying myself all the way down Han Jieun's throat, the desire I had been holding back exploded, and a scorching climax tore out of me.

I shuddered my hips back and forth, picturing myself flooding her face and mouth with every last drop of my hot semen.

Glk, glk.

White ropes of cum splattered across the bathroom floor and the toilet wall. All the humiliation and lust that had been building up under Jieun's heel erupted raw and unfiltered in that single moment.

"Haa… haa…"

Breathing hard, I roughly cleaned up with toilet paper and stepped out of the bathroom.

"Haa, should I just grab some convenience-store food and keep going, or finish everything and eat at home…"

I returned to my seat, slumped in front of the monitor, and was staring blankly into space when it happened.

Right in the middle of that indecision, a sound broke the silence from the far end of the dark hallway.

Click. Click. Click.

High heels. Who the hell would be here at this hour? Everyone had already gone home. There was no reason for anyone to show up this late.

Clack!

Suddenly the office lights blazed on and the door swung open.

My eyes went wide.

The person who walked through the door was none other than my mentor, Assistant Manager Han Jieun.

"…Huh?"

She wasn't wearing her usual stiff, stuffy office look.

She had on a highly revealing crop top and a short skirt that left almost nothing to the imagination.

Holy shit, so the rumors that she dresses slutty in private were true? I can see her tits and waist completely.

Her pale skin and smooth waistline were on full display, and the visual stimulation made the space between my legs—which I had barely calmed down in the bathroom—throb and swell again.

Wait. That means she literally ran out of the house in whatever she was wearing to relax…

Is this… is this actually because of that app?!

Jieun wore an expression that said she was thoroughly annoyed as she walked toward me carrying a heavy plastic bag in one hand.

"Ugh, this is so annoying. Seo Minwoo, why do you never eat when you work overtime and force someone who already went home to come all the way back?"

The completely absurd scolding hit me the moment she arrived, and I just stood there blankly.

My brain had short-circuited. Jieun shot me a look as if I were the ridiculous one.

"What are you talking about, Minwoo? You were starving, so I packed food and came back to the office at this hour!"

"Why do you always make people go through this kind of hassle? You're so high-maintenance."

She came all the way back to the office at this hour… just to bring me food?

In that instant, the half-joking command I had typed into the app earlier flashed through my mind like lightning.

…It was real?!

Goosebumps erupted across my entire body.

It was an actual working cheat key.

Watching Han Jieun accept this completely insane situation as perfectly natural "common sense" sent a strange thrill racing through me until I could barely breathe.

I only wrote it as a joke. If I'd known it was real, I should have ordered something way stronger and hotter—like making her offer her body outright.

Regret hit me late. I tried to remember exactly what I had typed, but I had scrawled it so carelessly that the precise wording wouldn't come back.

I was pretty sure it had something to do with food, though…

"Minwoo, what are you doing just standing there?"

"This is exactly why your proposals are always late. You're so slow at everything. Ugh, I hate it."

Jieun clicked her tongue and dragged me into the break room.

Once she finished setting the lunch boxes on the table and I carefully sat across from her, she suddenly scowled and snapped.

"Hey, why are you sitting over there?!"

"Huh? Wh-why… what's wrong?"

"If you sit there, how am I ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠supposed to feed you? Get over here next to me, now!"

…What? Feed me herself?

I couldn't believe my ears. She wasn't just bringing the food—she was going to put it into my mouth with her own hands.

"Ah… yes, understood."

I hurriedly scooted my chair right up beside hers.

At that almost-touching distance, a sweet, intimate feminine scent drifted from her skin and hit my nose.

The faint soap fragrance made it obvious she had just gotten out of the shower.

The stimulating smell of her body made my lower stomach grow heavy again.

"What are you waiting for? Open your mouth."

"Yes…?"

Jieun carefully scooped rice and side dishes onto a spoon and held it right in front of my lips, waiting.

Her expression was sulky, but her hands moved with perfect naturalness.

"Um, Assistant Manager… I can eat by myself…"

"What are you talking about, Minwoo? When you're hungry, of course I feed you myself. That's just common sense. Seriously, this is ridiculous. Just open your mouth already."

Common sense? What kind of common sense is this supposed to be?!

But having already felt the terrifying power of the app, I opened my mouth and obediently accepted every bite she offered.

Assistant Manager Han Jieun, feeding me with that prim little expression.

It felt exactly like a sweet date with a beautiful girlfriend.

The same arrogant mentor who, only a short while ago, had made me want to write an exposé on the company board and die together with her was now pressed right up against my side, diligently spoon-feeding me.

Seo Minwoo, you were born lucky as hell! Mom, Dad, thank you!

I screamed it inside while tears of joy welled up.

I polished off every last bite she fed me as if I were a starving man.

Once the food was gone, Jieun stood up as if nothing had happened and brushed off her clothes.

"Minwoo, clean up what you ate yourself. I'm heading out now."

"From now on, make sure you eat on time."

"If you starve again, I'll have to come all the way back here. Don't make me go through the trouble. Be careful."

"Ah… yes! Understood!"

As Jieun gathered her bag and prepared to leave, a sudden wave of regret and greed surged through me.

I wanted to give her another command before she went home.

I shot up from my seat, sprinted back to my desk like a madman, and snatched the smartphone off the surface.

Then I rapidly typed the next order.

Flash!

In that instant, a massive warning window blazed across the screen in blood-red letters.

"Ah… so that's how it is."

I was disappointed, but not crushed.

Instead my heart hammered so hard it felt ready to explode.

Because I had confirmed it was real.

Listening to the fading click of Han Jieun's high heels, I curled the corner of my mouth into a satisfied smile.

Tomorrow, when I came to work, what kind of new common sense would I push into that lofty assistant manager?

Already the space between my legs was swelling tight and hard again.

Tomorrow… I'm going to corrupt you for real, Assistant Manager Han Jieun.

That night marked the beginning of Seo Minwoo's long-suppressed revenge—and the start of a cruel, filthy training life.