信号

海英在角落发现了一台老对讲机，收到了关于未破的绑架案的信息。

The statute of limitations is lifted after the suspect's arrest. Hae-young joins Soo-hyun's team for the newly established cold case squad.

海英加入了长期未结案件专案组，材韩通过对讲机传递了信息。

Reality changes after Hae-young exchanges information with Jae-han. Hae-young tries to work together with Jae-han in 1989 to prevent the next murder.

在发现对讲机的谈话改变了过去之后，海英很困惑。

The ninth victim is Won-kyung, the woman Jae-han loves. A driver turns himself in, but Soo-hyun and Jae-han determine that his son is the real killer.

尽管上级反对，但是专案组开始调查京畿道连环杀人案。

Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.

海英离材韩失踪的真相更近了一步。

Seeking vengeance for the events that led to the death of his daughter, Kyung-tae commits a kidnapping after getting out of prison for burglary.

海英继续努力改变被错误地编结在一起的过去与现在。

秀贤死后，海英对他是否应该继续使用对讲机感到很苦恼。

Soo-hyun and Hae-young notice a connection between the burglary case and Da-hye, the woman who killed herself twenty years ago.

检测完多惠的指纹后，警察追踪到了她的所在。

海英怀疑池秀或许与材韩的失踪有关。

对讲机通话后，材韩发现秀贤和海英在同一组工作。

Hae-young and Soo-hyun arrest Jin-woo after coming to the conclusion that he is the killer. Hae-young asks Jae-han about the Inju rape case.

材韩前往仁州调查仁州女学生性侵案。

Hae-young becomes a suspect for the murder of Chi-soo. Jae-han realizes who the principal offender of the attack on Hye-seung is.

秀贤震惊地发现是池秀杀了材韩。

Soo-hyun and the others mourn after confirming that the remains belong to Jae-han. Hae-young learns that Jae-han used to look after him in the past.

材韩前往仁州，发现海英是顺宇的弟弟。

海英前往仁州，审讯曾指认自己的哥哥是主犯的人。

顺宇的死期临近，材韩赶往仁州拯救海英哥哥的性命。