This didn't add up.
"You should spend more time with your sister whenever you can. It's obvious she relies a lot on you," Lin Xian looked at Zheng Chenghe and asked his question indirectly:
"What do you do for a living?"
"I drive a taxicab," Zheng Chenghe casually replied:
"I usually work the day shift. In the evenings, I always stay here with Xiangyue, then bring her over to Yiyi's place to chat and help Yiyi with her rehabilitation exercises."
...
...
[Taxicab].
When Lin Xian heard this word, he felt uncomfortable all over.
He remembered New Year's Eve, the taxicab that had killed Xu Yun;
He then recalled the taxicab that had recently hit and knocked over Tang Xin;
The group of murderers seemed to take a particular liking to using taxicabs to commit their crimes... it was probably because taxicabs were inconspicuous and could easily blend in with the crowd, avoiding specific attention, and they were also rather misleading.