Thai woman formerly linked to No. 8 and Masashi. Moves to hide, raises autistic daughter Zen, and takes in Moom. Contracts cancer and depends on Zen and Moom's debt collection for treatment. Mortally wounded by No. 8 during the final confrontation.
Zin is Zen's biological mother and primary caregiver.
A past romantic relationship that fuels No. 8's jealousy and subsequent violence.
Zin and Masashi share a deep romantic bond that drives the initial conflict.
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