Oh, the Mysterious

Oh, the Mysterious is a South Korean television series starring Yoon Kyun-sang and Jung Hye-sung. It aired on SBS from November 27, 2017, to January 30, 2018, on Mondays and Tuesdays at 22:00 (KST) for 40 episodes.

Synopsis
About a framed escapee turned fake police detective (Yoon Kyun-sang) taking down bad criminals and learns to uncover his true identity.

Main

 * Yoon Kyun-sang as Kim Jong-sam/Oh Il-seung
 * A framed ex-convict and prison escapee who becomes a fake detective that becomes a part of Metropolitan Investigation Unit. He is smart and fast at what he does while being handsome and firm.


 * Jung Hye-sung as Jin Jin-young
 * An inspector of the investigation unit who is smart, athletic with an impressive performance record.

Seoul Metropolitan Police Agency

 * Kim Hee-won as Park Soo-chil
 * Do Ki-seok as Kim Min-pyo
 * Kang Shin-hyo as Kwon Dae-woong
 * Choi Won-young as Jang Pil-seong
 * Im Hyun-sik as Jo Man-seok

Institute for Future Economics

 * Jun Gook-hwan as Lee Kwang-ho
 * Kim Young-pil as Ahn Tae-jung

Food Company

 * Yoon Yoo-sun as Kook Soo-ran
 * Kim Hye-yoon as young Kook Soo-ran
 * Park Sung-geun as Kwak Young-jae
 * Oh Seung-hoon as Gi Myeon-jung
 * Kim Dong-won as Baek Kyung

Others

 * Jang Hyun-sung as Kang Cheol-gi
 * Kwon Hwa-woon as Hyeon Jin-gyeom
 * Choi Hyo-eun as Kim-ji
 * Jeon Sung-woo as Scab
 * Kim Ye-jun as young Scab
 * Kim Da-ye as Cha Eun-bi
 * Ok Ye-rin as Young Cha Eun-bi
 * Baek Eun-hye as Nurse
 * Jeon Ye-seo as Han Cha-kyung
 * Yoon Bok-in as Yoo Kwang-mi
 * Choi Dae-hoon as Kim Yoon-soo
 * Moon Woo-jin as Han Kang
 * Jason Scott Nelson as Drug lord
 * Jeon No-min as Jin Jung-gil
 * Yoon Na-moo as Song Il-chun

Production
The series is directed by Shin Kyung-soo of Deep Rooted Tree (2011) and Six Flying Dragons (2015) and written by Lee Hyun-joo of School 2013 (2012).

Ratings

 * In the table below, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
 * NR denotes that the series did not rank in the top 20 daily programs on that date.

International broadcast

 * In Singapore and Malaysia, the series aired within 24 hours after its original South Korean broadcast on Sony One under the title Doubtful Victory.