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. Series overview Cast 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