Six months had passed since Han Seojun graduated from medical school. Despite his young age, he had already earned a reputation among his professors for his intelligence, discipline, and ability to remain calm under pressure. While many of his classmates spent their free time socializing and building connections, Seojun had always kept his distance from others. He wasn't interested in friendships or meaningless conversations. The only people who truly mattered to him were his mother and his little sister, Arin.

That morning, dressed neatly for an interview at Tekoya Hospital for a position as a paramedic, Seojun walked beside Arin on her way to school. The six-year-old skipped happily along the sidewalk, her backpack bouncing lightly against her shoulders.

Seojun's thoughts, however, were elsewhere.

His father.

Even after years had passed, the bitterness remained.

The man had abandoned them the moment he learned that Seojun's mother was pregnant with Arin. He had walked away without hesitation, leaving behind a frightened wife, a twelve-year-old son, and an unborn child. Ever since then, Seojun had carried a quiet resentment in his heart. Every hardship his family endured traced back to that decision.

"Jun?"

Arin's small voice interrupted his thoughts.

Immediately, Seojun looked down.

His expression changed.

Arin's face had gone pale.

Her breathing had become uneven.

A familiar sense of dread settled in his chest.

"Arin," he said softly, kneeling in front of her. "Look at me."

She tried.

Her chest rose and fell rapidly as she struggled to pull air into her lungs.

"It's okay," Seojun reassured her, keeping his voice steady despite the panic beginning to build inside him. "Take slow breaths. I'm here."

He had helped her through countless asthma attacks over the years.

But this one felt different.

Much worse.

Arin's eyes widened in fear. She reached toward him as though trying to say something.

Then her legs gave out beneath her.

"Arin!"

Seojun caught her before she hit the ground.

The noise around him seemed to disappear.

People stopped and stared. Some rushed forward while others pulled out their phones to call emergency services. Voices echoed around him, but he barely heard them.

All he could see was Arin lying unconscious in his arms.

For the first time in years, he felt completely helpless.

At Tekoya Hospital, the emergency call was immediately classified as urgent.

Within moments, Dr. Kensei dispatched one of the nearest paramedic teams.

The crew consisted of Lei, Alya, Ken, and you—a foreign paramedic whose Asperger's syndrome often made crowded and chaotic situations difficult to handle. Despite this, you were widely regarded as one of the most brilliant paramedics at Tekoya Hospital. Your exceptional memory, sharp attention to detail, and ability to notice things others missed made you invaluable during emergencies.

The ambulance raced through the city streets with its sirens blaring.

A child in respiratory distress.

Possible loss of consciousness.

Every second mattered.

When the team arrived, the scene was already crowded with concerned bystanders and school staff.

Without wasting a moment, Lei, Alya, and Ken rushed toward the unconscious girl and immediately began assessing her condition.

Amid the chaos, Seojun remained kneeling beside Arin, his hands clenched tightly as he watched the paramedics work.

Then his attention shifted.

Not to the team treating his sister.

To you.

While the others moved with practiced confidence through the crowd, you lingered near the edge of the scene, visibly overwhelmed by the noise, the movement, and the dozens of strangers pressing in from every direction.

Your shoulders were tense.

Your breathing uneven.

You were trying to focus, trying to block everything else out.

Most people probably wouldn't have noticed.

Seojun did.

For a brief moment, despite the fear consuming him, his eyes remained fixed on you. There was something strangely familiar in the way you stood there—surrounded by people, yet somehow completely alone.