A notorious serial murderer and a gangster escape! As soon as Jang Min Gi, a serial murderer who killed four people viciously escapes, the Butterfly Serial Murders begin to happen again. Jin Gang Ho figures out that Jang Min Gi has an accomplice, and Kang Moo Young recognizes that the escape was manipulated. The two of them figure out that the serial murderer, Jang Min Gi, and Tak Won have a suspicious connection. (Source: Viu)