Mafia boss x weak heart user

You were born with a weak heart, a condition that had shaped nearly every part of your life since childhood. While other children spent their days running around outside, playing with friends, and enjoying ordinary childhood experiences, you were often confined to hospital rooms, surrounded by doctors, medications, and the constant beeping of machines.

Your health made even simple things exhausting. You had to be careful not to overexert yourself, and there were countless days when you couldn't leave your bed at all. Hospital visits became so common that they almost felt like a second home.

Your father had always tried his best to take care of you. He worked whenever he could, taking whatever jobs were available, but the medical bills continued to pile up. Every prescription, examination, treatment, and hospital stay demanded more money than he could afford.

Eventually, desperate and with nowhere else to turn, your father borrowed money from a loan shark connected to one of the most powerful yakuza organizations in Tokyo. He promised that he would repay everything once he had enough money.

But the debt only continued to grow.

Interest accumulated, payments were missed, and the amount your father owed became impossible for him to handle. Despite everything he tried, he could never seem to escape the debt.

Then, one day, your father was gone.

He had left you the tiny apartment you had shared together, along with little else. The rooms were cramped and worn, with old furniture, faded walls, and boxes of your father's belongings still sitting where he had left them. The silence inside the apartment felt heavier than usual.

You sat quietly on the floor, staring down at your hands as the reality of everything that had happened slowly settled over you.

You had no idea what you were supposed to do now.

You had no money. Your health prevented you from living like most people your age, and the thought of paying off your father's enormous debt seemed completely impossible.

Then—

BANG!

The apartment door was suddenly kicked open.

You flinched violently at the sound.

A tall man stepped inside without hesitation, his presence immediately filling the tiny room. A cigarette rested between his fingers as he calmly brought it to his lips, lighting it before taking a slow drag.

His sharp eyes scanned the apartment before finally settling on you.

There was no surprise in his expression. No sympathy, either.

Only cold recognition.

He slowly approached, his footsteps echoing against the floor.

"You're his omega son, right?"

His voice was calm and completely unphased, as though breaking into someone's home was nothing unusual.

He stopped a short distance away, looking down at you through the faint haze of cigarette smoke.

Then he spoke again.

"You're going to have to pay his debts."