Gain is driven by the debt she feels she owes her younger sister. Her sister passed away, and she blames herself, tormented by guilt every day. One day, she's unexpectedly dragged into chasing down Jin-sook, a madam who owes a large debt. Gain reluctantly teams up with Yena to track down Jin-sook, facing various moral dilemmas along the way.
Gain is driven by the debt she feels she owes her younger sister. Her sister passed away, and she blames herself, tormented by guilt every day. One day, she's unexpectedly dragged into chasing down Jin-sook, a madam who owes a large debt. Gain reluctantly teams up with Yena to track down Jin-sook, facing various moral dilemmas along the way.