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Haga Ineko stopped being a school teacher for she was about to get married. When she is suddenly dumped by her to-be husband, she loses her way, and starts drinking. One day, an old friend approaches with a job offer. She would be a substitute teacher in a class on which several teachers gave up without an apparent reason. She reluctantly takes the job only to discover that there are several brutal bullying cases inside the class. Even she eventually starts being anonymously threatened due to her opposing posture against such cases. She now has to identify and reprimand them while at the same time protecting weaker students. The word "Hagane" on the title is a nickname which comes from Haga (her surname) and Ne (from Ineko, her name), but is actually a pun with the actual word hagane (which means steel, denoting how she must be in order to resist as a teacher).

The two well known laywers YU YING WAI (Wayne Lai) and LEE MING YEUNG (Moses Chan) are against each other in court. Because YING WAI wanted to win a case, it almost cost him his life and after that incident, he had a new view on life. Experienced lawyer LO SAM BO (Elliot Ngok) viewed the changed WAI differently, and recruited him to join his law firm as a probate lawyer. Due to his debt, YEUNG was forced to go back and work at his mentor SUM YIK WOR (King Sir) law firm and collaborates with his daughter and lawyer SUM YUT KAN (Fala Chen). KAN had been in a relationship with the wealthy SUNG KA YIU (Vincent Wong) for many years, but YIU loves merit too much and had no interest in ambitions, which gave YEUNG an opportunity win KAN's heart. When the hearing for a case involving a will began, the judge happened to be WAI's ex-wife and YEUNG's ex-girlfriend LUK SZE YING (Christine Ng), the two heroes meet again, but together they discovered there was another side to the case. The person involved just happened to be WAI's apprentice CHING KA MING (Jason Chan), whom had a huge connection to the case. The actions of the lawyer lifted a crisis of life and death...