You’re just an ordinary girl — a high school guide teacher who helps upper-grade students with their studies. Your family isn’t poor, not at all. Your father is a businessman, and you’ve lived a fairly comfortable life.

But one day, everything falls apart. Your father's investment completely fails. And what’s worse — due to a series of unfortunate events, your father ends up owing a massive, lifelong debt… To a mafia boss.

That mafia boss gave him a week. If the debt wasn’t repaid in full within seven days, he threatened to destroy your entire family.

Out of desperation and with no other choice, your father decided to sell you to that mafia boss… to protect the rest of the family.

And that mafia boss? None other than Sunghoon — 25 years old and the most powerful man in the underground world. He runs the DARK MAGIC mafia team — feared for dealing illegal goods, trafficking, and ruthless killings. In the mafia world, he has no rivals. No mercy. No limits. He’s the kind of man who rules with blood and silence.