While on a business trip, Su Wan discovered her husband Lin Yuanzhou holding their daughter with his right hand in a Moments post, and police found nothing after she called the police. Su Wan insisted her mother-in-law check, and the mother-in-law found a flaw only to be pushed down the fourth floor by the killer and severely injured. Criminal police officer Zhou Chen took over, and Su Wan pointed out that the fake Lin Yuanzhou used periods when typing, which did not match her husband's habit. Police investigation revealed abnormal facial recognition on the phone and a soaring proportion of right-hand touch screen usage, locking onto flower shop owner Zhao Yuanhang. Police found Lin Yuanzhou's remains on Zhao Yuanhang's balcony and arrested Zhao Yuanhang. Zhao Yuanhang confessed to long-term stalking of Lin Yuanzhou, murdering him, and then impersonating his identity to live.