In the end, Ren Baqian failed to kill Wang Xunli.
Due to obstructions by Yang Sen and his promise that Wang Xunli would have no chance to take revenge, Ren Baqian relented after burying the chief culprit, Wang Zhi.
It must be mentioned that it was impossible for his earlier trip to Hong Kong to not have been found out.
However, he wasn't obstructed, and it was obvious that they had let him off once before.
After all, Wang Zhi had used means that were beyond the rules and deserved to die.
There was no point in killing Wang Xunli at the expense of offending Yang Sen. This was especially the case because Wang Xunli was under Yang Sen's control and Yang Sen had promised that Wang Xunli wouldn't have the chance to take revenge.
The words "no chance to take revenge" were rather interesting. If it were "will not take revenge," then it meant that there was someone holding him back. On the other hand, "no chance to take revenge" had some implications.