The person from the Weibo incident had indeed fled the country, but Mu Xiangyang had initiated an "online pursuit" for him. This way, when he returned to the country and made any activities or used his ID, the alarm would alert the system in the online pursuit. The local police would dispatch immediately to apprehend him.
After capturing the person, they investigated all his data and confiscated the ultra-portable laptop he was carrying. After professionals had analyzed it, it was confirmed that the video had indeed been released through his terminal. He just happened to be a computer expert and used some tricks to disguise and confuse the investigation afterward.
The police questioned him about how he got the video, but he refused to tell. Later when they checked his call records, they found a number he frequently contacted, which gradually led them to more information.
