The geneticist's words blur together as I stare at the paper in my trembling hands. One hundred percent sibling match. Those four words might save my daughter's life, but they're also about to shatter the carefully constructed world I've built over the past five years. "Ms. Chen, do you understand what this means?" Dr. Yamamoto asks gently, her eyes filled with professional sympathy that makes my stomach twist. I understand perfectly. My four-year-old daughter, Hana, lying in the pediatric ward three floors above us, has a half-sibling. A brother or sister I knew nothing about. A child who shares her father's DNA—the same father who walked out of my life the night I told him I was pregnant. "When can we proceed with contacting the donor's family?" My voice sounds hollow, distant, like it belongs to someone else. Dr. Yamamoto hesitates, and that pause tells me everything I need to know. "The match came from our national registry. The child was registered at birth by..." she glances at her screen, "Hayashi Takeshi and Hayashi Yuki." The room tilts. Hayashi Takeshi. Of course. The man I loved, the celebrated architect whose innovative designs now grace magazine covers across Asia. The man who chose his family's approval over me, over us. "How old is the child?" I whisper. "Four years, three months." I do the math instantly, the way I've done a thousand times in sleepless nights. Hana is four years, seven months old. Which means Takeshi's wife was already pregnant when he left me. Or got pregnant immediately after. Three months. He married her three months after our breakup. I know because I saw the wedding announcement in the architecture journal I should have stopped reading. I was six months pregnant then, working double shifts at the translation agency, my feet swollen and my heart broken. "Ms. Chen, I know this is difficult, but Hana's leukemia is aggressive. Without a bone marrow transplant in the next sixty days..." Dr. Yamamoto doesn't finish. She doesn't have to. "What do I need to do?" "We'll contact the family through official channels. They're not obligated to donate, of course, but given the circumstances, most families—" "He doesn't know about Hana." The confession spills out before I can stop it. "Her father doesn't know she exists." Dr. Yamamoto's professional mask slips for just a moment, revealing genuine shock. "I see. That does complicate matters." Complicate. What a sterile word for the chaos about to unfold. I'll have to face Takeshi, the man who chose tradition over love, who probably has the perfect family his parents always wanted. I'll have to tell him about Hana, about the daughter he never knew existed. And I'll have to ask him to convince his wife—the woman he chose over me—to let their son undergo a medical procedure to save the child from his past. My phone buzzes. A text from my mother, who's sitting with Hana: *She's asking for you. Brought her favorite bunny.* I close my eyes, seeing Hana's pale face, her bright smile that hasn't dimmed despite the poison they pump into her veins three times a week. She still believes in happy endings, in heroes who save the day. She doesn't know her hero is the father who abandoned us both. "Set up the meeting," I tell Dr. Yamamoto, my voice steadier than I feel. "Contact the Hayashi family. Tell them there's a match." "And if they ask questions about the recipient?" I stand, gripping my daughter's medical file like a lifeline. "Tell them the truth. Tell them it's his daughter."