The serial killer strikes again. This time, the annoying next-door neighbor had gone a little too far and paid the price with her life. At the call center, Kang Kwon Joo meets with Na Hong Soo to probe into the murder case Kang Woo was a suspect in and finds out he’s taking Tegretol—a prescription drug for seizures, manic-depressive disorder, schizophrenia, etc.¬—and sometimes forgets what he does. Meanwhile, Park Eun Soo ex-boyfriend visits her at headquarters uninvited that leads to a code zero. (thetvdb.com)