When facing Feng Wuhen, Shi Lei ultimately chose not to kill him to seize the single-attribute Spirit Stone within his body, but chose to forgive him instead.
This decision was actually the result of careful consideration by Shi Lei, and it was not entirely due to Feng Wuhen's past actions.
First of all, Feng Wuhen was not a malicious person. After interacting and conversing with him, Shi Lei discovered that Feng Wuhen was actually a very simple person, even a very persistent one.
Chapter 178