The Day My Mother Fell from the Building, My Stepmother Put on a Diamond Ring

My mother died in an "accident", and the murderer became my stepmother. She is an investor in my dad's hotel. She looks gentle and virtuous, speaks beautiful words, and has a very nice voice. My dad seems to love her more than my mom. During these years of being a stepmother, she always pretended to be the same as she was before and after. No one ever doubted her sincerity towards me. Even my grandmother praised her as a good stepmother. I originally thought she was a good person, until one day, I saw her diary, which contained information about the process of her killing my mother... I pretended to be dormant and patient, and finally waited for her most glorious day—— I tore her perfect persona into pieces with my own hands, leaving her with a ruined reputation and a life worse than death. I thought everything was over, but I found out that the murderer was not only her, but also my close relatives.