Well, it could be that Dumbledore, in some fanfic versions, figures it out first and then reveals it to Harry. Dumbledore is often portrayed as having a deep understanding of magic. He might have noticed some strange magical patterns or behaviors related to Harry that led him to suspect and then confirm that Harry was a Horcrux. And then he would tell Harry about it, which is how Harry comes to know.
Chapter 867, "Then what does our child count as?!", is the clearest early answer because it turns Jiang Meng's situation into a concrete plot event. Early on, Lili's brother, Chen Nanyu, was the only ray of light in his dark.... By the end, This time, his goal was singular—Jiang Meng..
Chapter 340, "Holy Heart Hospital", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event.
Chapter 491, "A Cleaner Handling", is the clearest early answer because it turns Are's situation into a concrete plot event. Early on, After leaving the cave, the more Nina thought about it, the more.... By the end, The fragments before her were all written with Jiang Li's address and....
Chapter 726, "She Has Already Tried to Keep a Low Profile", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Su Yinwan was using the money she had recently acquired to boost...
Chapter 724, "He Is Not Minghai's Child", is the clearest early answer because it turns Minghai's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Yan's statement left everyone silent again.
Chapter 515, "You actually kidnapped a man?!", is the clearest early answer because it turns Team's situation into a concrete plot event. The chapter gives readers a real answer by opening on After Miss Su Yinwan left in a huff, Shang Shuyue's mood greatly...
Chapter 731, "Ye Chu Died", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Dean, can I really not do it? and ending on She'd been acting off these days..
Chapter 581, "Where is everyone? Where have they all gone?!", is the clearest early answer because it turns Luo Xuan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Inside the tent, no one felt like sleeping.
Chapter 927, "Jiang Li: Deceased, Do Not Disturb", is the clearest early answer because it turns Jiang Bufan's situation into a concrete plot event.
Chapter 763, "It must be Jiang Li who tied her up!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter gives readers a real answer by opening on But within a short time, she sensed that something was off.