A young autistic woman named Zen (Yanin Vismistananda) has developed uncanny martial arts skills by watching television, and from living next door to a Muay Thai academy.

The girl is the daughter of Zin (Ammara Siripong), the Thai wife of Yakuza boss Masashi (Hiroshi Abe).

Zin was previously the girlfriend of Thai gangster No. 8 (Pongpat Wachirabunjong), who was jealous of her relationship with rival gangster Masashi, so he cut off one of Zin's toes, and forbade her from seeing Masashi.

Zin then falls ill with cancer, and does not have the money to pay for treatments. One day, Zen's friend discovers a list of debtors in an old notebook, from the days when Zin was a high-interest moneylender under No. 8. In order to get money to pay for her mother's cancer treatment, Zen decides to collect on the debts, which leads to confrontations with various criminal gangs and, eventually, No. 8.

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