After an uncomfortable reunion with Si Yeong, Tae Joo resumes tracking the serial killer. Ji Won, a female reporter, also joins the operation to catch the murderer. Meanwhile, Gi Beom proposes to Sun Yeong, but soon grows uneasy after seeing her leave work in her male colleague’s car. At the same time, Tae Joo, dispatched to a college student protest, spots a male student who resembles Gi Beom and begins to grow suspicious.