Song Ha-yeong pursues a criminal known for targeting young women. Kook Yeong-su looks to form a team of criminal behavioral analysts.

Ha-yeong consults a criminal to understand a killer’s motives. An arrest leads to a startling interrogation session and a break in the case.

A horrific accident forces Ha-yeong to reflect on the mental impact of his work. Meanwhile, two people go missing from a karaoke bar, raising suspicions.