Li Yifei would never have imagined that a dropped box of condoms could betray his identity.
Of course, this was also absolutely a coincidence. If anyone else had picked up the box, it would have been utterly useless. They certainly wouldn't think to do a fingerprint comparison. Even if another police officer happened to find the box and did a fingerprint comparison, they wouldn't go on to obtain Li Yifei's fingerprints.
The most important factor was Lin Qiong, who had seen him numerous times and had seen the mysterious person a few times, managed to overlap the two in her mind, ultimately discovering that the mysterious person was in fact Li Yifei.
Although Lin Qiong had suspected that Li Yifei was the mysterious person, she was still deeply shocked when she saw the proof. That playful and smiling Li Yifei, who was indulgent in life, turned out to be such a powerful individual. There was no way Lin Qiong could reconcile the two images.