I Marked My Mortal Enemy as My Omega - Chapter 1

Sheng Yu leaned back in her seat with her arms crossed, dreaming she had won two hundred million in the lottery. Before she could cash it in, she was jolted awake by the wails of a baby.

Irritated, she straightened up and glanced around. The noise culprit was three rows ahead—a child standing on an adult’s lap, its head peeking over the seat, snot and tears streaming down its face. The parent made no effort to soothe it, letting it cry freely.

“Can you control your kid?” someone finally snapped.

“Kids cry—it’s natural. You were like this too when you were little,” retorted the middle-aged Alpha man in his forties, casually eyeing the speaker while releasing his pheromones. The oppressive aura of a B-rank Alpha instantly filled the cabin.

The complainer immediately fell silent—just an ordinary Beta with no intention of provoking an Alpha.

The Alpha waited a moment longer, and when no one else spoke up, he withdrew his pheromones.

Sheng Yu put on her noise-canceling headphones, though they did little to help. The child kept wailing for over twenty minutes before finally quieting down.

The moment the spaceship docked, Sheng Yu grabbed her luggage and hurried off. Outside, she noticed several crew members stopping the Alpha, with a striking young woman standing beside them.

Curiosity got the better of her, and she circled back. As she neared, she heard the girl’s voice—calm, precise, and devoid of emotion.

“Under Chapter 3, Section 4, Article 6 of the Imperial Alpha Conduct Code, Alphas are prohibited from releasing pheromones in public spaces without cause. Violators are subject to seven days’ detention.”

“So, was I wrong to report you?”

“Damn,” Sheng Yu thought, stealing another glance at the girl. She actually reported him? That took guts.

The girl wore gold-rimmed glasses, her long hair cascading down with a few strands braided into small pigtails. Her pale skin almost glowed under the sunlight.

Sheng Yu wanted to keep looking, but the girl’s sharp gaze suddenly locked onto her. Instinctively, Sheng Yu averted her eyes and quickened her pace, forcing herself not to glance back—outwardly composed, inwardly panicking.

Before summer break, rumors had circulated about the merger of First High and Thirteenth High. Sheng Yu had dismissed it as a joke—until the official relocation notice arrived. The combined school would retain the name Thirteenth High, as it held more prestige than First High, much to the chagrin of the latter’s students.

Post-merger, the student body swelled to five thousand, making it the largest high school not just in City A but in the entire Eleventh District.

She could’ve stayed at home, but now she had to live on campus. She wondered who’d be lucky enough to become her roommate.

After exiting the station, Sheng Yu boarded the intercity shuttle to the school. It was already packed, so she tugged her cap lower and found a secluded corner to sit.

“Sheng Yu?”

She sighed internally but still lifted her head and waved at the person who called her name. Dozens of eyes immediately turned her way.

During her first year of high school, a photo of her playing with a cat went viral across schools in City A, earning her the title of “Most Beautiful Omega in High School.” However, she still hadn’t undergone differentiation yet.

She was certain she couldn’t be an Omega and had clarified this multiple times, but everyone remained convinced she’d eventually differentiate into one. No one believed a Beta could be this beautiful, nor that an Alpha could be only 160cm tall.

It was infuriating.

The person calling her sat down beside her. Sheng Yu glanced at them: “Didn’t I tell you not to call my name in crowded places?”

This was Liao Keke, one of Sheng Yu’s friends. They’d known each other since childhood and had been in the same class all the way through high school. As Sheng Yu put it, theirs was purely a “twisted fate.”

Last year, Liao Keke had differentiated into a Class A Alpha and had already been pre-selected by the Empire’s First Military Academy. She just needed to meet the score requirements after the college entrance exams to begin training there.

“Oops, I forgot,” Liao Keke tossed Sheng Yu two lollipops as consolation before taking one for herself and unwrapping it.

Sheng Yu: “…”

“You’re getting stingier.”

“As a poor person, I have to save where I can,” Liao Keke replied.

Sheng Yu smirked. “When are you leaving?”

“About ten minutes,” Liao Keke checked the time.

“Fine.” Sheng Yu sighed, noticing someone approaching—the brave soul who’d reported the Alpha earlier. The person scanned the cabin before settling by a window. Sheng Yu couldn’t tell if it was her imagination, but their eyes seemed to meet again.

“What’s wrong?”

“Nothing.” Sheng Yu shook her head and yawned. “Don’t talk to me, I’m going to sleep.”

“Is sleeping all you ever do?”

“Pretty much.” Sheng Yu crossed her legs.

“By the way, lots of people from Thirteenth High are asking for your contact info. Should I give it? They’re all Alphas.”

“No.” Sheng Yu frowned. “Actually, should I request an extra desk when school starts?”

“Huh?”

“I don’t think one desk will be enough for all the gifts.” She sighed again, looking genuinely troubled.

Liao Keke: “…”

“Tch.”

As the spacecraft started moving, Sheng Yu tried hard to return to her dream about those 200 million credits, but it was gone for good.

Thirteenth High was already enormous, and after the merger and expansion, it had grown even larger.

Walking through campus, Sheng Yu remarked, “Is Thirteenth High just ridiculously wealthy?”

“Definitely,” Liao Keke agreed. “Too bad we can’t be in the same class anymore.”

“Oh, what a relief.” Sheng Yu clapped sarcastically.

“Heartless.”

“Absolutely.” Sheng Yu grinned.

The school separated differentiated Alphas and Omegas, while undifferentiated students attended classes with Betas.

The entire senior year had 137 Alphas—zero S-class, nine A-class, and the rest B-class. There were even fewer Omegas—just 73 in the whole grade, with zero S-class, two A-class, and the remainder B-class.

Sheng Yu followed the school’s notice to her assigned dormitory, noticing that the girl from earlier had gone to the adjacent Alpha building.

No wonder—she was an Alpha.

The school’s dormitories were strictly divided according to ABO dynamics, with a total of eight buildings. Alphas and Omegas each had single rooms, and to prevent pheromone interference, their buildings were placed at opposite ends of the campus, as far apart as possible. Betas occupied five buildings, being the largest group, and their dorms were four-person rooms with further subdivisions. However, since Sheng Yu wasn’t staying in those, she didn’t look into the details.

Her dorm was in another building, also a four-person room.

Sheng Yu pushed open the door and glanced inside—the living conditions were much better than she had expected.