The Heroine of Koi Turns Black, and Her Luck Is Repaid a Hundredfold

I am the heroine of the Koi novel, and everyone in my family knows it, so they pamper me and use the good luck I bring to successfully squeeze into the rich circle. But when I was fourteen, they learned that the real heroine was someone else. So they brought back a girl, and from then on, my love gradually transferred to her. My parents said she had suffered a lot and asked me to be patient. My brother said that she was his ideal sister and asked me not to bully her. But what they don't know is that I am a black koi, and if I am unwilling to help them, they will have to pay back a hundred times what they took from me. And the heroine they brought back and longed for was here to steal their luck.