Kridsana, confident and justice-driven, returns from abroad to be with her older sister Kridtika, who disapproves of Kridsana's strong-willed nature. Kridtika is married to a womanizer husband, who deceives Nubthong into an affair, leading to her tragic suicide. After Nubthong's death, her brother Karnpetch seeks revenge on those responsible, including Kridtika and Kridsana.