"My reasoning is as follows: The murderer, for some reason, wanted to kill Feng Yinxuan.
He or she knew that Feng Yinxuan had a habit of keeping a diary and was aware of where Feng Yinxuan usually kept it. That day, Feng Yinxuan had written an entry in the diary due to being wronged by family members. Thus, the murderer tore out the first page of this diary entry, taking it out of context so that anyone who saw it would think that Feng Yinxuan had developed suicidal thoughts.
The murderer placed this 'Testament' in a conspicuous spot for others to easily find, while disposing of the second page and the entire diary itself."
"Next, the murderer lured Feng Yinxuan to the rooftop and pushed him off, causing his death from the fall. After the incident, the police discovered Feng Yinxuan's 'Testament' and believed that no one would harbor resentment against a ten-year-old child to the point of murder, concluding that it was a suicide case. The killer of Feng Yinxuan remains at large."
Murong Sixuan spoke clearly, his tone calm as if recounting an event unrelated to himself. Feng Xunyu sighed deeply after hearing this reasoning, trying to calm herself as she slowly said, "It makes sense. I never expected we were kept in the dark all along. If it weren't for you, perhaps Yin Xuan would never find peace."
"Next," Sixuan glanced at Feng Xunyu and bit his finger, a habitual gesture when he was deep in thought. "Let's check your parents' room."
"Why?" Feng Xunyu asked uneasily, sensing an ominous premonition that more difficult truths were about to be uncovered.
Sixuan replied, "Look for a family photo and bring it to your mom." His tone was flat, concealing his true feelings.
Upon entering Feng Leng and Lin Wei's bedroom, Feng Xunyu skillfully found a photograph in the bedside drawer.
The photo was taken several years ago; it featured Feng Leng, Lin Wei, Feng Xunyu, Feng Guyu, and Feng Yinxuan—all five family members smiling brightly (except for Feng Guyu), radiating happiness.
Yet this happiness, this joy, had long since vanished.
In just a few short years, everything had changed dramatically. Feng Xunyu gently traced her fingers over each face in the photograph, her eyes filled with nostalgia and pain.
As Feng Xunyu gazed at the photo, reminiscing about the past, Sixuan, like a keen detective, missed no detail.
He noticed two blood donation certificates placed beneath the photo.
Reaching out, he picked up one of the certificates with a gentle yet cautious motion. Opening the first page, he saw the words "Blood Donation is Glorious, Selfless Contribution" staring back at him. Flipping to the next page revealed details about the donor's blood type, name, and ID number; it turned out to be Feng Leng's blood donation certificate.
The other certificate belonged to Lin Wei.
Sixuan licked his right index finger, a subconscious gesture when he discovered a clue. He glanced at Feng Xunyu and said casually, "Your dad has type O blood, and your mom has type A blood."
His words pulled Feng Xunyu back from her memories. She set down the family photo and looked up at Sixuan, responding with a soft "Hmm," her tone laced with confusion as she wondered why he suddenly brought up blood types.
Sixuan continued, "Children born to parents with type O and type A blood can only have either type O or type A blood."
"Right, my sister and I both have type O blood," Feng Xunyu tilted her head and asked, "Is there a problem?" Her eyes were filled with bewilderment, completely unaware of the astonishing secret hidden behind this question.
"Just now in Feng Yinxuan's room, while you were looking for Feng Yinxuan's 'Testament,' I found his medical examination report in a drawer," Sixuan paused for a moment, licking his lips before continuing in an even tone, "Feng Yinxuan's blood type is AB."
"What?" Feng Xunyu was taken aback, her eyes widening in shock and disbelief as if she had just heard an unbelievable tale.
"One possibility is that Feng Yinxuan is not your parents' biological son and is merely an adopted child. However, I lean more towards another possibility—that is—"
Sixuan raised an eyebrow and articulated each word carefully, "Feng Yinxuan is your mother's child with another man who does not have type O blood."
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