Yes, Sir. Sorry, Sir! (Cantonese: 點解阿Sir係阿Sir^[a]), is a 2011 Hong Kong television drama starring Moses Chan, Linda Chung, Tavia Yeung, and Ron Ng produced by Lau Kar Ho. Yes Sir. Sorry, Sir! is a TVB production.

"阿Sir" is a way to address both teachers and policemen. The meaning of the title is "So it turns out '阿Sir'(teacher) was an '阿Sir'(policeman)".

Despite the fact that he comes from a long line of disciplined workers, Law Yiu-wah (Moses Chan) is a teacher at a notorious school. One day, he was urged to resign after being vilified by his students as a peeping Tom. At present, the triads have expanded their drug network at local schools. Wah, who has turned into a cop, is told to go undercover at the school where he used to teach. At school, he is impressed by the enthusiasm of a new teacher Ho Miu-suet (Tavia Yeung). He also comes to realize he was too strict with his students in the past. With a determination to boost students’ confidence, Suet invites bowling expert Koo Ka-lam (Linda Chung) to teach bowling at the school. When Wah learns about her triad background, he decides to go after her hoping to learn more about the triads. Wah also finds himself in a contest of wits with Inspector Ching Man-lik (Ron Ng), who has been assigned to work as a liaison officer at the school. On one hand, Man is attracted to Suet but on the other, she only loves Wah. All of a sudden, Wah, Suet, Lam, and Lik find themselves involved in a complicated love square.

• Moses Chan as Law Yiu-wah
• Linda Chung as Carman Koo Ka-lam
• Tavia Yeung as Ho Miu-suet
• Ron Ng as Nick Ching Man-lik
• Ram Chiang as Poon Kwok-shing
• Law Lok-lam as Chiang Hung
• Joseph Lee as Ko Sun
• Savio Tsang as Ngai Fung
• Queenie Chu as Ceci Koo Ka-sin
• Law Kwan-moon as Cheung Pak-chuen
• Cilla Kung as Chung Ka-bo
• Brian Chu as Mok Chak-kei
• Dickson Wong as Fan Tai
• Calvin Chan as Chiang Chun
• Angel Chiang as Lin Li Xiang/Yumi

<Yes Sir, Sorry Sir> in Episode 27, When Linda Chung < Miss Koo> crumble, Average Points 34 and Peaking Points 38

•  Malaysia - 8TV (Malaysia)

a ^{^} The original title "點解阿Sir係阿Sir" was actually written in Cantonese; the title of the drama could be translated in Mandarin as "為何阿Sir是阿Sir"