Hell's Personal Trainer
“I’m hungry…”
Breakfast time at Arcana Hospital - Abyss Branch.
A stark silence hung over the dining table.
The steaming rice and stew that always wafted inviting aromas were nowhere to be seen. Instead, only shriveled strips of jerky and plain water sat forlornly on the table.
“Director, is this really it?”
Ma Dongtak stared incredulously at the jerky piece the size of his palm.
For him, who feared muscle loss more than death itself, a protein shortage was as good as the end.
“Ration it out. Even this is stuff we snatched from the hyenas’ emergency stash.”
Jinhyeok said bitterly, gulping down the water.
Food shortage. A foreseeable disaster from the early days of opening, when they’d treated any monster in sight and shoveled out meals like it was nothing.
And now their mouths had multiplied. Balakas the big eater, Luna in her growth spurt, and all the inpatients besides.
The instant foods from Earth were gone, and the local plants and animals were off-limits due to poison.
“This won’t do. We’re hanging on by the power of food!”
Lee Shinwoo declared a strike, setting down his spoon.
“That’s why I said we’re going. South.”
Jinhyeok stood from his seat.
He draped his gown with grim resolve and packed his bag.
This time, not just medical tools—empty sacks and coolers piled high.
“Two goals. First, acquire the Essence of Gluttony. Second, loot ingredients.”
Jinhyeok’s eyes gleamed.
“The southern lands are ruled by the ‘Lord of Gluttony.’ That means all the good eats are concentrated there. We gorge ourselves, pack the leftovers. Got it?”
“Yes, sir!”
Vitality sparked in the hunters’ eyes. They looked ready to punch out the devil’s grandpa for a meal.
“Ma Dongtak, you ready?”
“Of course, bro. I’ve been warming up these muscles for today.”
Ma Dongtak flexed his biceps in his skintight workout gear.
A whistle hung around his neck, and he gripped the ‘Love Whip’ in hand.
Today, his role wasn’t tank. It was Hell’s PT Trainer.
“Let’s go. Time to slim some fat asses down.”
The southern border, Forest of Satiety.
The landscape here was utterly unlike the rest of the Abyss.
No rot stench—instead, a sweet, oily aroma permeated the air. Trees drooped with plump, luscious fruits.
Rivers flowed not with clear water, but sticky honey and milk.
“Whoa… is this heaven?”
Seo Jihu swallowed hard, reaching for a fruit.
“Don’t touch it!”
Luna shouted urgently.
Whoosh!
The branch he’d reached for suddenly writhed like a serpent, baring sharp fangs to snap at him.
If Seo Jihu hadn’t frozen it with ice magic in panic, his wrist would’ve been gone.
“That’s a Cannibal Apple Tree! It lures with fruit scent and eats you!”
Luna warned.
“Figures. No such thing as a free lunch in this world.”
Jinhyeok clicked his tongue.
Every lifeform in the southern lands embodied an extreme ‘eat or be eaten’ ecosystem.
The tastier it looked, the deadlier it was.
Then, bushes rustled, and a massive wild boar burst out.
No ordinary pig.
Marbling bloomed like flowers on its back, oil gleaming slick on its skin—a Prime Bacon Boar.
“Oink oink!”
It charged the hunters.
“Lunch is served!”
Ma Dongtak whooped and rushed forward. Bam! One punch. The boar went down without a squeal.
“Damn… look at that marbling. This is 1++ grade.”
Lee Shinwoo marveled as he butchered it on the spot.
An impromptu BBQ party kicked off.
The roasted bacon boar was divine—fat melting tenderly in the mouth, chewy meat perfection.
“So good… so damn good…”
Yoo Isu wrapped bites in leaves, eyes misty with emotion.
“Pack it. Everything we see.”
Jinhyeok swept meat into the cooler.
Dangerous, yes—but a blessed land too.
Bellies full, they pressed through the forest to the southern heart: Castle of Gluttony.
Castle of Gluttony.
Less a fortress, more a colossal ‘food court’ or ‘slaughterhouse’.
Walls of giant beast bones and hides; moat bubbling with boiling oil.
Even the gate guards were obese. Fat orcs dozed, gnawing chicken legs.
“Hey. Delivery’s here.”
Jinhyeok woke one.
“Ugh? Delivery? What delivery?”
“Jajangmyeon. Nah, house call. Your king’s dying.”
“Insolent! Insulting His Great Majesty Glutton King!”
The orc swung his mace but wobbled from sheer weight.
Ma Dongtak’s light trip sent it tumbling, rolling under its own mass.
“Tsk tsk. Joints shot. Obesity’s the root of all evil.”
Jinhyeok stepped past the fallen orcs into the castle.
Inside was worse.
Mountains of food waste.
Obese beasts wallowing in it.
This wasn’t a kingdom of ‘gluttony’—it was one of ‘adult-onset diseases.’
The throne room. On the massive table sprawled—no, sat—a mountain of flesh.
The southern ruler, Glutton King Beelzebub.
Once a dignified demon, now buried in fat, features barely visible.
Too bloated to twitch a finger, he mechanically chewed food hand-fed by maids.
“More… bring more… I’m hungry… so empty…”
His voice echoed hollow.
An unending hunger no amount of eating could sate.
A curse.
“Stop eating. Your gut’ll burst.”
Jinhyeok leaped onto the table.
Beelzebub’s eyes swiveled laboriously to him.
“Who… are you? New chef? Or… ingredient?”
“Doctor. Here to take your fat off.”
Jinhyeok activated Eyes of God.
The status blinked red.
At this rate, cardiovascular failure in a month—no surprise.
“Your toes hurt, right?”
Jinhyeok asked.
“……!”
Beelzebub flinched.
His feet were swollen purple, gout agony at the slightest breeze.
“Diabetes dulled the sensation at your toe tips? Won’t be long before amputation.”
“Grr… shut up…”
“And you can’t sleep nights? Fat crushing your airway, choking awake, stress-eating. Vicious cycle.”
Jinhyeok’s fact bombs.
Beelzebub couldn’t retort.
King in name, slave to appetite in truth.
A prison: too full to move, so nothing but eat.
“Save me…”
Beelzebub teared up.
“It hurts… my feet are driving me mad… please, just end this pain…”
“I can. One condition.”
Jinhyeok tossed a chicken leg aside.
“Fasting from today. And exercise.”
“Exercise…? I can’t move!”
“I’ll make you. Our trainer’s top-notch.”
Jinhyeok snapped his fingers.
Ma Dongtak strode out, joints cracking, eyes hungry.
The gym rat’s instinct: turn that fatberg into muscle.
“Hello, client! Ma Dongtak here for your PT starting today! Goal: drop body fat by 10%! You got this!”
“Contract time.”
Jinhyeok presented the bill.
◈ Diet Program & Complications Treatment: 1x Essence of Gluttony
◈ Diet Management: Unlimited Southern Forest Ingredients Access
◈ PT Fees: To Be Negotiated (Pay in Sweat)
Beelzebub stamped it trembling. He’d sell his soul to devils for survival.
“Deal sealed. Manager Ma, commence.”
“Roger! Music, cue!”
Lee Shinwoo’s speaker blared upbeat aerobics.
Ma Dongtak blew the whistle.
TwEEEt—!
“Alright, client! Up you get! Start with lower body squeeze!”
“I… can’t stand!”
“No whining! With those 500kg deadlift vibes!”
Ma Dongtak hauled Beelzebub up by the belly fat.
S-rank brute force.
The 10-ton behemoth lurched.
“One! Two! Squat stance! Knees in!”
“Aaaagh! Legs breaking!”
“Won’t break! Bones solid! Deeper! Butt back!”
Hell’s PT began.
Beelzebub crumpled screaming; Jinhyeok dosed Pain Relief Injection and Vitality Potion.
No pain, surging energy—he had to keep going, tears streaming.
“I’m… dying…”
“Client! You’re sweating! Fat’s burning! Perfect!”
“Mr. Lee Shinwoo, space magic for pull-up bar! Mr. Seo Jihu, freeze floor for traction!”
Korea’s strongest ganged up on the demon lord.
Burpees, lunges, jumping jacks…
The castle shook.
An hour later. Beelzebub foamed out, collapsed.
But waste and sweat poured off—swelling mysteriously down.
“Huff… huff…”
Beelzebub panted. Brutal. Near death.
Yet… not bad.
Blocked vessels cleared, heart pumping strong.
Not stuffed fullness, but vibrant aliveness.
“Good work, client. Today’s meal: chicken breast salad.”
Ma Dongtak offered the bowl.
Greens he’d have ignored before? Post-workout nectar.
Beelzebub devoured it.
“Good…”
Small portion, yet full. Curse of Gluttony weakened.
“Working already.”
Jinhyeok checked his pulse. Blood sugar dropping.
“Essence as promised.”
Beelzebub heaved up.
From his gut near the stomach, a red-glowing orb: Essence of Gluttony.
A black hole mana core devouring all.
“Take it… and tomorrow… more training?”
Beelzebub eyed hopefully.
“Of course. 4-week full course. No refunds.”
Jinhyeok grinned.
Third essence secured. One left: the west’s Madness King.
Back at Arcana Hospital - Abyss Branch.
Jinhyeok’s crew returned, Lee Shinwoo’s subspace stuffed with ingredients.
Festival vibes.
Luna grilled meat, hyenas gnawed bones, baby beasts munched fruit.
“No more food worries.”
Yoo Isu smiled warmly.
“Yeah. Just one left.”
Jinhyeok gazed west.
Red lightning crashed amid endless explosions—a warzone.
The western ruler, Madness King Asura.
Strongest of the four demon lords, most untalkative ‘battle maniac.’
Anger issues. Bipolar. Destruction instinct. Madness incarnate.
“That one’ll be tough. Fists before words.”
Yoo Isu fretted.
“I know. That’s why I prepped.”
Jinhyeok pulled his ace from the bag’s depths.
Not from Earth.
Abyss materials, nights with Luna: a wonder drug.
“Stick for mad dogs? Nah, docs use this.”
Violet liquid in a glass vial.
Ultra-Strong Mana Sedative - ‘Calm Down’.
Legend: one hit turns dragons meek.
“We leave tomorrow. Westward.”
Final showdown. Jinhyeok loaded his vaccine syringe.
Time for the last puzzle piece to save his wife.