Episode 12 S01 E12

Yoon Shi-yoon (as Seo Do-Won) Gyeong Su-jin (as Han Seo-Kyung) Shin So-yul (as Lee Jung-Min) Cho Wan-ki (as Woo Jae-Hyeok) Cha Yeob (as Lee Sung-Wook) Kim Dong-young (as Kim Jin-Woo) Lee Hang-na (as Oh Mi-Sook) Baek Jae-woo (as Kang Joon Young [Detective])

detective revenge serial killer train murder investigation parallel universe