He raised them until they were adults.

He gave them money, status, and everything they needed to stand on their own, then sent them out into the world. As the youngest master of a powerful megacorporation, he assumed his responsibility toward the talented orphans was over.

Then his family fell.

Stripped of his wealth and residency rights, he ends up in the dangerous lower tier with nothing left to his name. Just when he's about to be robbed in the slums, he's rescued by Narin, the first orphan he ever raised, now a feared assassin known as the Cleaner.

To Narin, however, his decision to send her away was never abandonment. It was simply a test she had to pass before she could return to his side.

And judging by the way she welcomes her fallen former master into her fortified hideout, she has no intention of letting him leave again.