Li Yifei didn't act on his own; he still informed his family and shared his analysis. Su Mengxin and the other women listened carefully to his conjectures and did not stop him from going to the Sunx family. Instead, they advised him to wear the bulletproof vest and not to be careless.
The reason they didn't go directly to the Sunx family was because they couldn't determine whether it was the Sunx family, Song family, or someone else who kidnapped Meng Xiaofei. They investigated clues first; without clues, they couldn't identify the opponent. Now, there were some clues, but the opponent always seemed one step ahead, cutting off clues just as they emerged. Since the Sunx family was under surveillance all along, it seemed that their suspicion had lessened a lot.
