Quiz of God

Quiz of God   is a South Korean television series broadcast on cable channel OCN. It was the first medical/forensic crime investigation drama to air in Korea. The series follows genius but eccentric neurosurgeon and forensic doctor Han Jin-woo (played by Ryu Deok-hwan) and his team as they solve suspicious deaths and unravel mysteries involving rare diseases.

The title refers to a local saying that rare diseases are like quizzes God gives to humans so as not to become too arrogant. The first season dealt mostly with inherited rare diseases including porphyria, phenylketonuria, muscular dystrophy, Guillain–Barré syndrome, reflex anoxic seizures and Savant syndrome. Fabry disease, Kleine–Levin syndrome and congenital insensitivity to pain with anhidrosis were featured in the second season.

Main

 * Ryu Deok-hwan as Jin-woo Han, neurosurgeon and forensic doctor
 * Yoon Joo-hee as Kyung-hee Kang, detective
 * Choi Jung-woo as Kyu-tae Jang
 * Park Joon-myun as Young-shil Jo, medical examiner
 * Kim Dae-jin as Seong-do Kim, forensic scientist
 * Ahn Nae-sang as Tae-shik Bae
 * Lee Donghae as Han Shi-woo
 * Kim Jae-kyung as Im Tae-kyung
 * Yoon Bo-ra as Jung Seung-bin
 * Park Hyo-joo as Moon Soo-an
 * Kim Jaewon as Hyeon Sang-pil

Recurring

 * Park Da-an as Go Yoon-jung
 * Kim Geon-woo as Nam Joo-nam
 * Chu Seung-wook as Park Seung-wook
 * Park Ji-a as Seo Yeon-joo
 * Ahn Yong-joon as Jung Ha-yoon
 * Lee Seol-hee as Min Ji-yool
 * Kim Se-hyun as Cha Woo-bin
 * Lee Ha-rin as Lee Young-eun
 * Park Hee-von as Lee Ran
 * Han Seo-jin as Yoo So-yi
 * Kang Sung-pil as Nam Ki-yong
 * Han Seung-hyun as Gu Doo-jin
 * Seo Yoo-jung as Shin Yeon-hwa
 * Yoon Jin-young as Jo Il-yeob
 * Choi Go as Han Jin-woo
 * Kim Jun-han as Kwak Hyeok-min
 * Han Ji-wan as Hong Na-yeo
 * Kwon Eun-soo as Kim Han-sook
 * Go Geon-han as Kang Soo-ha's son
 * Kim Ki-doo as Nam Sang-bok
 * Yoo Jung-rae as Lim Si-hyun

Guest appearances

 * Kim Seung-yeon as psychic
 * Kim Tae-woo as Jae-seok (ep. 1)
 * Kim Byung-ok as entertainment company CEO (ep. 2)
 * Park No-shik as Choi Kyung-ho (ep. 3)
 * Lee Ji-eun as Hong Seong-mi (ep. 3)
 * Lim Hwa-young as Yeo-rang (ep. 4)
 * Im Je-no as Joon-seo (ep. 5)
 * Jung Eun-pyo as gynecologist (ep. 6)
 * Lee Dal-hyung (ep. 7)
 * Seo Ji-seung as Shi-eun (ep. 8)
 * Ahn Yong-joon as Jung Ha-yoon (ep. 9–10)
 * Yoo Hae-jung as Eun-ok, abused child


 * Choi Sang-hak
 * Han Yeo-wool
 * Han Yeong-gwang as Lee Kyeong-seok
 * Lee Kyeong-in as Deok-hoon
 * Seo Han-gyeol
 * Lee Han-wi as chief of police
 * Kim Jong-seok
 * Kim Jeong-gyoon
 * Kang Seong-min as Jang in-ho (ep. 3)
 * Oh Kwang-rok as Boss
 * Lee Il-hwa as Hwang Kyu-ri (ep. 5)
 * Jeon Moo-song as a priest (ep. 12)
 * Park Dae-won


 * Yoo Jae-myung as Anesthesiologist Lee
 * Park Jae-jung as Park Jong-min
 * Kim Ga-eun as Yoon So-jung
 * Hong So-hee as Shin Hee-soo
 * Jung Joon-won as Woo-ram (ep. 4)
 * Alexander Lee as Lee Han-seo (ep. 6)
 * Yang Ohn-yoo as young Han-seo (ep. 6)
 * Choi Ah-ra as Chae-kyung
 * Go Kyung-pyo as Seo In-gak (ep. 10–12)
 * Kang Bit
 * Moon Ji-young as Mi-kyung
 * Yoon Joo-hee as Kang Kyung-hee (ep. 12)


 * Lee Yoo as Min Ji-hee
 * Lee Do-yeon as Da-mi
 * Jang Seung-jo as Lee Jae-joon
 * Lee Soo-yong as Park Jung-wook/Panna Nuen
 * Cho Hye-jung as Jung Mi-hyang (ep. 1)
 * Kim Jin-geun as Mi-hyang's father (ep. 1)
 * Lim Yoon-ho as Ko Kyung-han (ep. 2)
 * Park Min-ji as Park Ha-young (ep. 2)
 * Song Ji-hyun as Ahn Hee-yeon (ep. 3)
 * Hwang Seung-eon as Ahn Hyo-yeon (ep. 3)
 * Choi Tae-hwan as Lee Soo-yong (ep. 4)
 * Han Ki-won as Hong Ki-joon (ep. 4)
 * Kim Heung-soo as Lee Jong-seok (ep. 5)
 * Baek Bong-ki as Lee Hwan-seung (ep. 6)
 * Kwon Eun-soo as Kim Han-sook (ep. 6)
 * Jang Kyung-yeob as Lee Jong-hyuk (ep. 7)
 * Seo Woo-jin as Kang Do-jin (ep. 7)
 * Ji-soo as Kim Eun-shil (ep. 7)
 * Sung Doo-sub as Lee Chul-min (ep. 8)
 * Jang Se-hyun as Lee Woo-min (ep. 8)
 * Jung So-young as Choi Seo-yeon (ep. 9)
 * Kim Bo-mi as Go Gil-nyeo (ep. 10)
 * Choi Ho-joong as Park Chan-hyung (ep. 10)
 * Yang Geum-seok as Jang Hae-won, Jin-woo's mother (ep. 10–12)
 * Choi Cheol-ho as Seo Sang-woo (ep. 11–12)


 * Lee Sang-yi as Park Jae-sung (ep. 1,2)
 * Lee Young-sook as Kim Soo-soon, Jae-sung's mother (ep. 2)
 * Jung Myung-joon as Min Byung-tae (ep. 1,2)
 * Kim Kyung-min as Jung Chang-man (ep. 2)
 * Baek Su-ho as Im Doo-yeon (ep. 3,4)
 * Jo Seung-yeon as Lee Jae-hyung (ep. 4)
 * Park Se-hyun as Lee Ji-eun (ep. 4)
 * Kim Dong-bum as Huh Sang-chan (ep. 3,4)
 * Tak Woo-seok as Yoon Hyun-jong (ep. 5,6)
 * Seo Yu-jeong as Shin Yeon-hwa (ep. 5,6)
 * Han Seung-yong as Hwang Kyung-chul (ep. 5,6)
 * Shin Young-eun as Yoon Se-eun (ep. 5,6)
 * Jang Won as Kwon Young-pil (ep. 5,6)
 * Hong Ji-young as Nam Sang-bok's sister (ep. 7,8)
 * Yang Joo-ho as Nam Sang-bok's brother-in-law (ep. 7,8)
 * Im Yoo-sung as Kim Seo-joon, Nam Sang-bok's nephew (ep. 7,8)
 * Jeon Se-hyeon as Ra Hee-young (ep. 7,8)
 * Oh Yoo-jin as Lee Eun-soo (ep. 7,8)
 * Jang Won-hyuk as Yang Oh-soo (ep. 8)
 * Jung Hye-rin as Oh Soo-young (ep. 8)
 * Kang Jae-min as Shin Sun-woo (ep. 9,10)
 * Jung Woo-young as Lee Young-rak (ep. 9,10)
 * Choi Young-woo as Jeon Du-yeop (ep. 10)
 * Kim Do-kyung as Ha Yoon-woo (ep. 10)

International broadcast
The first three seasons aired in Japan on BS-Japan,  and the fourth season aired on DATV starting from December 16, 2014.