What seemed like love turned out to be surveillance: Kan Xin, posing as Yu Menglong’s devoted girlfriend under Cheng Qingsong’s orders, allegedly handed over his damning USB evidence for a fat payout and secret exile abroad, leaving fans to ask if betrayal sealed his tragic fate. th

Rumors of Betrayal Swirl in Yu Menglong Death Case as ‘Girlfriend Spy’ Claims Target Kan Xin

Beijing, February 26, 2026 — Nearly six months after actor Yu Menglong fell to his death from a high-rise in Beijing’s Chaoyang district, online speculation has shifted focus to his rumored romantic partner, actress Kan Xin, with unverified accusations portraying her as a planted informant who allegedly betrayed him by delivering a USB drive of incriminating material. The claims, amplified on platforms like Weibo, Douyin, YouTube, and overseas Chinese-language forums, suggest Kan Xin was instructed by director Cheng Qingsong to infiltrate Yu’s life, monitor him, and ultimately hand over evidence that could have exposed alleged corruption or money laundering in the entertainment industry.

Official records and police statements offer no support for these narratives. Beijing authorities closed the case shortly after the September 11, 2025, incident, attributing the 37-year-old’s death to an accidental fall after heavy drinking, with toxicology results and surveillance footage showing no signs of foul play. Yu’s management studio and his mother issued statements urging the public to avoid unfounded speculation and accept the accident ruling.

The “girlfriend spy” theory emerged in late October 2025, fueled by self-media figures like Li Muyáng on YouTube and circulating social media posts. Commentators pointed to 2021 paparazzi photos showing Yu and a woman—later identified by netizens as Kan Xin—engaging in affectionate behavior, including hand-holding and embraces. Some alleged this relationship was engineered: Kan Xin, a Tianjin Music Conservatory graduate and Golden Rooster Award nominee for her role in Song of Spring (recommended by Cheng Qingsong), supposedly maintained close ties to industry figures implicated in rumors, including Cheng and producer Xin Qi.

Posts claim Kan Xin leaked details of a USB drive Yu allegedly possessed, said to contain proof of financial irregularities tied to powerful entertainment or political connections. After the death, speculation intensified with claims she received payment to relocate abroad, effectively silencing her. A now-deleted Weibo post from Cheng Qingsong on September 11 referenced plans to attend a fashion show with Kan Xin that day, accompanied by chat screenshots (later removed), which some interpreted as suspicious timing. Photos of Kan Xin with Cheng, Xin Qi, and others at events have been recirculated as evidence of overlapping networks.

Kan Xin has not publicly addressed the allegations, and no statements from her representatives have surfaced. Cheng Qingsong has repeatedly denied involvement in Yu’s death, posting clarifications and alibis in the immediate aftermath and rejecting links to any gathering that night. Other named figures, including actress Song Yiren, have faced similar unproven accusations of orchestration or monitoring.

Industry observers note that China’s entertainment sector often breeds such rumors amid opaque power dynamics, exploitative contracts, and occasional high-profile scandals. Past cases involving coercion or “hidden rules” lend plausibility to distrust, but experts caution that viral claims frequently rely on selective screenshots, anonymous tips, and pattern-seeking without corroboration. Fact-checks on platforms have debunked related hoaxes, such as fabricated audio or protest footage.

Fans continue to demand transparency, with hashtags like #JusticeForYuMenglong trending sporadically despite moderation. Petitions call for reopened inquiries, full autopsy details, and release of building surveillance—requests authorities have not entertained. The USB narrative, in particular, echoes earlier unverified rumors (including one alleging a drive hidden in Yu’s body), which police never confirmed.

As speculation persists, the case highlights challenges in separating grief-driven theories from evidence in a tightly controlled media environment. Without new official developments or verifiable proof of betrayal, Kan Xin’s alleged role remains firmly in the realm of online conjecture, a poignant but unsubstantiated chapter in a tragedy that refuses to fade.