Abandoned Sister: I'm Just His Obligation

The day before my stomach cancer surgery, I receive news that my brother, Darnell Huff, has been kidnapped. The kidnappers demand a ransom of 500 thousand dollars. They threaten to dismember him and feed him to the dogs if I don't pay. Remembering how he once risked his life to save me from human traffickers, I ignore my doctor's warnings and cancel the surgery. Clutching the money, I rush to the entrance of an abandoned factory. But before I can go inside, I hear a conversation coming from within. "Even if you like Amber as your sister, she's still the fake heiress. Erin is your real sister. She just came back, and you're deceiving her so callously. Isn't this a bit much?" Darnell spins a lighter in his hand. His eyes are dark and full of disdain. He says, "She made Amber feel insecure. Amber is the most important person to our family. Even if she isn't biologically related to us, she'll always be the only sister I acknowledge." The other voice interjects, "Then why did you save Erin in the first place? You gave her hope only to disappoint her. She's been going to the hospital constantly lately. Aren't you worried that—" "Enough!" Darnell cuts him off without hesitation. "She survived more than ten years living a hard life in the countryside. She's tough as nails. What could possibly happen to her? Even if she's not well, she won't die from it. "I only brought her back to fulfill our parents' dying wish. Once Amber calms down, I'll give Erin some money and send her back to the countryside. Whether she lives or dies after that has nothing to do with me." Every word pierces me like a knife. So the kidnapping is nothing but a lie. Darnell only brought me back because of our parents' last wish. But what he doesn't know is that I have given up my only chance of survival to come and save him...