Flashback: The children's biological mother sits in a cramped office, her hands trembling as she speaks to a social worker:
"My children must stay together. I don't care about your rules or your system! If you separate them, you'll destroy them. Do whatever you want, but don't break this promise!"
The social worker hesitates, caught between the mother's desperate plea and the rigid rules of the system.
When the adoptive woman is told about the condition, her face tightens. She reluctantly agrees to take both children, but her tone reveals her true feelings:
"I don't want the boy. I only wanted the girl. But… fine. If this is the only way."
Kaki overhears part of this conversation. The coldness in the woman's voice stays with him, like a shadow in the back of his mind.