S01E06: Episode 6

The meaning behind the drawings on the puzzle pieces is uncovered.

Season 1

Kim Da-mi
Kim Da-mi
Yoon Ena
Son Suk-ku
Son Suk-ku
Kim Hansaem
Kim Sung-kyun
Kim Sung-kyun
Yang Jeong-ho
Hyun Bong-sik
Hyun Bong-sik
Choi San
Kwak Ja-hyung
Kwak Ja-hyung
Roh Su-kwang
Jang Gyeok-su
Jang Gyeok-su
Hyeon Ho-geun / Hangang Police Station Chief
Jeong Man-sik
Jeong Man-sik
Tae Dong-su / Captain
Ahn So-yo
Ahn So-yo
Yun Go-eun