Old Time Buddy: To Catch a Thief (Chinese: 難兄難弟之神探李奇; Jyutping: naan4 hing1 naan4 dai6 zi1 san1 taam1 lei5 kei4; literally "Difficult Older Brother, Difficult Younger Brother-Detective Lee Kei") is a 1998 Hong Kong period romantic comedy television drama created and produced by TVB, starring Gallen Lo, Gordon Lam, Maggie Cheung, Elaine Ng as the main cast.

Original broadcast began on Hong Kong's TVB Jade channel 3 August till 4 September 1998 every Monday through Friday during its 7:30 to 8:30 pm timeslot with a total of 25 episodes.

His first clue leads him to a nightclub, where he is reunited with Tse Sei, a slick talent manager and Kei's former classmate.

The other tenants include brassy girl Siu Fong-fong, who tends the coin toss game booth at the park, and martial artists Cheng Po-chu and her mother.

At the amusement park, Kei finds similarities between Cheng's acts and the martial arts used by the "Black Rose".