The serial killer organization "The Sanctioner" has struck again, this time unexpectedly uniting with Ou Weilun's university mentor Qu Wenxi. What on earth is the purpose of the Sanctioner's murders? Over nearly 10 years, multiple serial crimes have been committed—what purpose could there possibly be?! Xia Wei rescues the imprisoned Ye Qiu, and together with Ou Weilun's friend Niangniang, captures Qu Wenxi. The Sanctioner calls to provoke them once more, preparing for the final showdown.