This drama is adapted from the series of novels of the same name, as the third part of the series, which tells the story of Haruko Nakajima (played by Mao Daichi), a cosmetic surgeon from Nagoya City, Aichi Prefecture, who is almost in the center of Japan, and is a stingy ghost with a poisonous tongue. Still, she will save those who are in trouble. Such a Haruko and her friend Izumi Kikuchi (played by Marika Matsumoto) came to Bangkok, Thailand. There, Haruko encounters an investment scam. Haruko's anger is at its climax after learning that her friend's female doctor has also suffered a romantic scam! In Thailand, the land of smiles, Haruko's big counterattack begins!This drama tells the story of Ippei Omori, a bad man who is forced to the edge of life and hates his family and children, lives with his brother-in-law of a single father and his children in order to be elected to the parliament. In the process of confronting family, society, and Japanese problems in daily life, the worst man gradually builds a relationship with his brother-in-law and his children like a real family, and gradually begins to want to create a better society, and finally seriously participates in the election and becomes a candidate, depicting the "worst man in Japan" who struggles to change his family, society, and Japan.