Overview
- ENA launches the 12-episode series in its Monday–Tuesday slot with worldwide access on Viki.
- Park Hae-soo plays demoted detective Kang Tae Joo, who believes several killings were done by the same offender.
- Lee Hee-joon portrays prosecutor Cha Si Young, whose shared school past with Kang drives a tense working partnership.
- The production says the first episode brings a string of murders to light and uses a prologue and epilogue to shift between 1988 and 2019.
- Early previews describe a gritty, character-focused tone and note echoes of the Hwaseong murders as a reference point.