Jo I-na finds her uncle murdered beside a puzzle piece but can't explain her presence; ten years later, as a criminal profiler, she investigates murders where victims are found with similar puzzle pieces.
EPISODE 1
Episode 1
Detective Hansaem suspects Ena after she fails to remember anything about her uncle's murder.
EPISODE 2
Episode 2
Ena receives a second puzzle piece shortly before discovering another victim; Hansaem suspects it's not a coincidence and begins investigating while Ena tries to find the link between the two.
EPISODE 3
Episode 3
Ena begins working at the Hangang Police Station to try and solve a case she believes is linked to her uncle's murder 10 years ago; a wary Hansaem starts collaborating with her and a prime suspect emerges.
EPISODE 4
Episode 4
Ena and Hansaem set off to investigate a mysterious body found in a reservoir; when they think the case is closed, Ena gets caught off guard by something unexpected.
EPISODE 5
Episode 5
A third puzzle piece arrives just as a locked-room murder occurs; as the duo draws closer to catching the killer, they agree to work more closely to uncover the real truth behind the puzzle murders.
EPISODE 6
Episode 6
Hansaem and Ena try to uncover the meaning behind the drawings on the puzzle pieces and the killer strikes again just as they identify the next victim.
Kim Da-mi
Son Seok-koo
Kim Seong-gyoon
Hyeon Bong-sik
Kwak Ja-hyoung
Jang Gyeok-su
Yoon Jong-bin
Lee Eun-mi
