C.I.D. is a Singaporean police drama which aired in 2006 on MediaCorp Channel 8. The series debuted in June 2006 and was screened on weekday nights at 9pm. The series was directed by Chong Liung Man and starred Tay Ping Hui and Qi Yuwu in the main lead roles. Five years later, Chong would go on to direct award-winning police blockbuster C.L.I.F., which also features Tay and Qi in the main roles as colleagues in the CID. Rare for a locally produced drama, certain scenes were filmed on location outside Southeast Asia; there were several scenes which took place in Taiwan and were filmed in the country itself.