Police partners Zhao and Liu were on a routine mission to apprehend a suspect who had harmed an employer. However, the suspect unexpectedly managed to attack them and held them at gunpoint. In this life-threatening moment, a bystander intervened to help the police. But shockingly, Liu ended up arresting both the suspect and the helper. Zhao disagrees with Liu's actions. What will she do to defend the kind-hearted bystander? Why was this helper arrested?