From Romance Rumors to ‘USB Betrayal’ Claims: Unpacking the Kan Xin Allegations in Yu Menglong Mystery
Shanghai, February 26, 2026 — The enduring mystery of actor Yu Menglong’s fatal fall has given rise to one of its most dramatic subplots: allegations that his purported girlfriend, Kan Xin, served as a long-term informant who betrayed him by surrendering a USB drive of explosive secrets, possibly under direction from filmmaker Cheng Qingsong. Circulated widely since October 2025 across Chinese social media and international outlets, these assertions paint an image of calculated deception, where personal intimacy masked surveillance and led to a payoff enabling Kan Xin’s reported departure overseas.
Police maintain the September 11, 2025, incident was non-criminal, citing alcohol impairment as the cause of the 37-year-old’s plunge from his apartment. No autopsy or forensic contradictions have been publicly released, and early statements from Yu’s family emphasized acceptance of the accident finding over rumor pursuit.
The betrayal storyline draws from fragmented online sources. Netizens identified Kan Xin from 2021 candid shots of Yu with a companion displaying couple-like closeness. Reports describe her as a planted figure, tasked with tracking Yu amid his alleged possession of damaging files—often framed as money-laundering records implicating entertainment elites or higher connections. Claims assert she relayed the USB’s location or contents, precipitating events that culminated in his death, followed by compensation and exile.
Supporting “evidence” includes Kan Xin’s documented professional links: nominated for Best Actress at the Golden Rooster Awards for a film backed by Cheng Qingsong, photographed alongside him and producer Xin Qi, and appearing in group images with other rumored associates. A September 11 Weibo entry from Cheng mentioning shared plans with Kan Xin (deleted shortly after) fueled timing suspicions, as did her presence at a fashion event that afternoon—hours after Yu’s fall.
Neither Kan Xin nor Cheng has responded directly to the accusations. Cheng has issued denials of any role in the death, emphasizing alibis and dismissing connections. No legal actions or official probes into the USB or espionage claims have materialized, and authorities have addressed misinformation by detaining individuals for spreading false narratives in related contexts.
The persistence of these stories reflects broader anxieties within China’s show business: unequal leverage, invasive monitoring, and fears of retribution for those who challenge norms. While isolated real abuses exist, the specific Kan Xin–USB plot aligns more with conspiracy patterns seen in high-profile deaths—amplifying coincidences into causation without hard proof.
International coverage, including in Vision Times and Economic Times, has highlighted the rumors but noted their reliance on anonymous tips and unverified media. Domestic censorship limits open discussion, pushing much of the narrative to overseas channels and fan communities that organize calls for justice.
For now, the allegations serve as a stark illustration of how grief and distrust can transform tragedy into elaborate suspicion. Absent concrete documentation of the USB, betrayal payments, or orchestrated romance, the claims against Kan Xin endure as powerful online folklore rather than established fact—leaving the core question of Yu Menglong’s final hours unanswered beyond the official accident determination.
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