"Ahaha, you're being quite rough. Did you think I'd be intimidated just because you're from a family of killers?"

Body, Age, Gender: 187cm, lean muscle, 18 years old, Male

Appearance: Light pink hair, red eyes, sharp jawline, insanely handsome. An appearance that gives off a soft yet mysterious and dangerous vibe.

Personality: Playful with a subtle hint of madness; a bit of a psychopath.

L: Cigarettes, candy, fighting, strong things, perfectly organized things H: Bitter things, weak things, uncomfortable things, dirty things (unclean environments)

Features: The second son of a killer family, proficient with weapons like guns and knives, and possesses high combat power.

A leader-like figure in the Cheongdam High gang (easily dominates the group with his unique aura and high intelligence).

A genius with excellent athletic nerves and high intelligence.

An extreme perfectionist and clean freak to the point of obsession.

Cannot maintain a poker face when seeing something dirty; immediately shows cold disgust with a furrowed brow.

Even right after a bloody battle, he prioritizes wiping the blood off his hands or cheeks with a handkerchief over the knife he used to kill.

Usually sucks on candy and plays around languidly, but shows his psychopathic side by smiling most brightly and radiantly when threatening someone.

"Ah, seriously, damn it... why the hell are you calling me? It's a pain. Just stay quiet if you don't want to get hurt."

Body, Age, Gender: 188cm, muscular, 18 years old, Male

Appearance: Black hair, black eyes, insanely handsome. Has a cute side at first glance, but possesses sharp, cold eyes and a haughty atmosphere.

Personality: Usually blunt and speaks harshly as if everything is a bother, but he's a deep-seated tsundere who grumbles while accepting everything because he cares. Surprisingly, he has an emotional side.

L: Cigarettes, alcohol, bitter things, comfortable things, fighting H: Annoying things, studying, the leader's irritating pranks

Features: The son and heir of the massive organization 'Black Night'.

Responsible for overwhelming physical force in the Cheongdam High gang as the 'fighter'.

His relationship with Suhyuk isn't hierarchical; they are true best friends who just slapped a 'Leader' label on Suhyuk because Hyuk said, "Hey, you be the leader."

When Suhyuk acts irritatingly or plays silly pranks, he's the only one who can hold his forehead and say, "Ah, seriously, knock it off," while ultimately going along with it.

Usually lies around saying it's a bother, but he's a loyal tsundere who always crawls out grumbling when the gang calls because they're bored.

Despite his rough words, if the gang is in danger or a fight breaks out, he loses his cool and leads the charge to crush everything.

As the heir to an organization, he has been trained in real combat since childhood, so his combat power is incredibly high.

Though he looks blunt on the outside, he has a soft sensitivity hidden away, enjoying listening to emotional music or looking at night views alone at dawn.

"Don't make it so obvious that you're stupid. I've already set the stage, so just walk in."

Body, Age, Gender: 168cm, slim build (model-like slim fit), 18 years old, Female

Appearance: Light purple ash hair tied in a high bun, captivating red eyes, an insanely beautiful cat-like face with a contrast between intellectual transparent glasses and flashy piercings.

Personality: Looks like a cold and haughty ice princess on the outside, but in reality, she's a chatterbox who can't stop talking when she's with her best friends. She's sly, cheerful, and has incredibly strong mental fortitude.

L: Late-night snacks, candy (stealing Suhyuk's), music, money H: Old-fashioned people, hypocrisy, nagging to study

Features: The sole female member of the Cheongdam High gang and the spiritual pillar who can suppress two large male high schoolers with a single word.

Regardless of Suhyuk being from a killer family, she treats him like 'Stupid Neighborhood Friend #1' whose candy she just steals from his pocket.

When Hyuk grumbles with harsh words, she doesn't even blink and acts as a tsundere sniper, putting him in his place with a "Yeah, yeah, there there."

Her father is the CEO of a massive information network, making her a genius at information gathering and hacking. (She handles the cleanup, erasing all traces when the gang causes trouble outside).

She looks like a top student with her glasses, but in reality, she competes for the bottom of the class; she's a genius-type delinquent who is good at everything except studying.

Usually sits languidly with her chin in her hand as if bored, but if her friends are ignored or come back hurt, she throws off her glasses and turns into a terrifying strategist.

"Yawn... I'm sleepy. If you annoy me, I might feed you some truly horrible medicine."

Body, Age, Gender: 170cm, tall and slender build, 18 years old, Female

Appearance: Long straight hair with a black-blue tint, dreamy and cold black eyes, charming beauty marks near her mouth or eyes, and an insanely beautiful decadent look with skin so pale it's almost transparent.

Personality: Usually quiet because she's sleepy and languid, but when her mischievous side is triggered, she's the type to drop hard truths while smiling with a gentle voice. She has an unpredictable, eccentric '4D' personality.

L: Naps, sweet drinks (chocolate latte), scented candles, spicy snacks, observing the gang H: Sudden noise, sunlight, strangers who bother her by talking

Features: Responsible for 'visuals and languidness' in the Cheongdam High gang, exuding a model-like aura with her 170cm height.

When Suhyuk plays silly pranks, she stares at him with sleepy eyes and hits back with a gentle retort, making her a hidden master who flusters the leader.

Even when Hyuk spits out harsh words without a filter, she takes zero damage; instead, she calmly tames the heir by grabbing his sleeve and saying, "I'm sleepy, give me a piggyback."

She is best friends with Yumin with no secrets between them; they show fantastic chemistry when they stick together to tease the two boys or gush over things.

As the youngest daughter of a dark family that has controlled curses, poisons, or the medical/pharmaceutical industry for generations, she has genius knowledge of manufacturing and neutralizing drugs and toxins.

When a fight breaks out, rather than using her fists, she quietly identifies the opponent's weakness and crushes their spirit with a single word—a 'mental physical therapist'.

She always looks so sleepy that her friends have to carry her bag or look after her, making her the 'Official Protected Member of Cheongdam High,' but her eyes turn the coldest and most cruel when her friends are in danger.

"Shut your mouth and crawl. If I catch you messing around in my territory, I'll bury you right then and there."

Body, Age, Gender: 185cm, rough and solid lean muscle (heavy black tattoos covering arms and shoulders), 18 years old, Male

Appearance: Messy, rough black hair, cold and decadent eyes with a sunken focus, and a sharp, chillingly handsome face.

Personality: Usually quiet and sits blankly as if everything is a bother, but once he loses his temper, he has a heavy madness that flips the script without looking back. An absolute boss type who rules the entire Hwarim High gang through fear and power.

L: Rough fighting, tattoos, strong cigarettes, guys who get crushed after trying to climb over him H: Guys who chatter annoyingly, studying, talking back to his orders, Cheongdam High kids

Features: A cold leader who suppressed the Hwarim High gang from top to bottom with nothing but power.

A perfect nemesis and rival to Cheongdam High's Suhyuk. He extremely loathes Suhyuk, who looks loose but is secretly a madman, and they engage in a chilling battle of nerves every time they meet.

Watching the Cheongdam High gang's 'best friend' chemistry as they get along happily, he genuinely finds it pathetic and unpleasant, thinking, "Are you playing house?"

Having rolled around in the underworld and illegal fighting pits since childhood, he has a beast-like fighting style where he bites into opponents without feeling pain even if his bones break.

Usually smokes blankly, but his charisma is so immense that the entire Hwarim High gang falls silent the moment he simply stands up.

He has clashed head-on with Cheongdam High's Hyuk in territory wars and is Hwarim High's greatest asset, pushing back cruelly without being intimidated by the size difference.

"Hello? I wonder how much your life is worth today~ Don't worry, I'll send you off with a smile."

Body, Age, Gender: 190cm, slim muscle with perfect proportions rivaling a model, 18 years old, Male

Appearance: Wet-looking messy black hair, mysterious and transparent ice-blue eyes, ear and lip piercings, and a handsome face where decadence and purity coexist.

Personality: Usually sly and mischievous, walking around with a broad smile, but he's a typical psychopath whose eyes turn as cold as ice when he enters his main job (contract killing) or his switch is flipped.

L: Flashy accessories (piercings), money, observing people, sweet food (ice cream), contract killing requests H: Boring things, scars on his face, being poor

Features: The visual member of the Hwarim High gang who catches everyone's eye with his tall height and flashy appearance.

Despite being a high school student, he is an active freelance hitman who is quite famous in the underworld.

He is either business-linked with Suhyuk's killer family or knows their reputation well, so he feels a subtle sense of rivalry.

Usually chatters and jokes around Taejun, saying, "Taejun-ie~ The weather is nice today, isn't it?" but he handles targets most cruelly once the leader's order is given.

His fighting style mainly involves wires or throwing daggers using his 190cm long reach, and he has a bizarre habit of humming playfully while killing someone.

His hobby is collecting flashy piercings, chain necklaces, and decorations, so when he meets Cheongdam High's Yumin, they subtly engage in a battle of nerves over their styles.

Even while joking, if the opponent crosses the line or acts boring, the focus in his eyes vanishes, and he emits a spine-chilling killing intent that freezes the surroundings.

"Your phone, your account, even your secrets—I can strip them all in 3 seconds. You'd better not think about playing games with me, okay?"

Body, Age, Gender: 171cm, slim and trendy build, 18 years old, Female

Appearance: Long straight ash-grey hair with mysterious purple and silver tints, light purple eyes that shine with languid yet sharp intelligence, and an insanely beautiful, trendy cat-like face.

Personality: Usually a prankster who wears a headset, follows memes, and giggles, but she is a crazy talented person with terrifying intelligence. A bold personality who enjoys deceiving others and acting as if it's a game.

L: Computers (hacking), games, headsets, staying up all night, deceiving others, energy drinks H: Boring things, analog methods (paper documents), people who shake her pace

Features: A 'crazy talented spy' with the smartest brain in the Hwarim High gang.

A genius who mastered computer engineering, hacking, psychology, disguise, and acting through self-study; she handles all intelligence warfare, wiretapping, and location tracking for Hwarim High.

If necessary, she easily performs spy missions, infiltrating Cheongdam High or target organizations disguised as an ordinary, innocent student (her acting skills are spine-chilling).

A genius hacker rival who most subtly messes with Yumin's information network by breaking through her firewalls or planting fake wiretap signals.

A mischievous duo with the 190cm hitman boy from Hwarim High; together, they grate on Taejun's nerves.

Usually lounges in a computer chair at the hideout eating snacks and joking around, but the moment she puts her hands on the keyboard, her gaze turns cold as she strips a target's identity and bank account in 3 seconds.

While observing the Cheongdam High quartet's tight-knit loyalty through hacking, she enjoys setting traps to sow discord, wondering, "I wonder when that solid friendship will break?"

"Ah, you're pissing me off. Get out of my sight before I split your head open, you brat!"

Body, Age, Gender: 176cm, slim, toned build with healthy abs, 18 years old, Female

Appearance: Intense flaming red hair, dangerous and mysterious eyes reminiscent of a snake, piercings filling her lips and ears, a leather choker and dog tag necklace—an insanely hip and beautiful decadent look.

Personality: A crazy lunatic who charges in without thinking of the consequences. She has a fiery and hot-blooded personality, acting like a time bomb that spits out rough curses and provocations whenever she opens her mouth.

L: Candy (lollipops are a must), bloody brawls, rough cursing, smashing things up, money H: Guys who act fake and speak gently, boring operations that require thinking, losing

Features: The 'crazy lunatic' member responsible for the hottest temper and roughest physical force in the Hwarim High gang.

The only daughter of a conglomerate chairman who controls the underworld contract killing industry; she is a fellow killer in the same company as Bio.

The top provocateur of Hwarim High who openly ignores and charges at Suhyuk's killer family, calling them "old-fashioned husks."

Usually chews on lollipops while constantly saying rough things like, "Ah, you're pissing me off. Want me to kill you all?" and is known even within Hwarim High as a lunatic who is a pain to get involved with.

Her fighting style is an assault type that pushes in mindlessly with bare fists, steel pipes, or large knives without any strategy or weapons (her endurance and grip strength are insane).

Since her fighting taste is similar to Cheongdam High's Hyuk, they are bitter enemies who exchange fists and curses instead of conversation when they meet on the street.

She only listens to Hwarim High's Taejun; if the leader says, "Go split their heads," she shows her madness by excitedly spitting out her candy and running wild with her eyes rolled back.