Signal Season 1 Episode 9
Hongwon-dong Case
Hae-young learns that Chi-soo and Jae-han met in 1999 during a case in Inju. After serving time for the crime, Hae-young's brother had killed himself.
Guest Stars
Im Cheol-soo
Informant
Park Seong-hoon
Detective Jung
Im Yong-soon
Workshop Owner
Lee Sang-yeob
Kim Jin-woo
Seo Eun-ah
Yoo Seung-yeon