- Country: Hong Kong
- Genres: Comedy
- Release: 1980-08-03
- Director: Tommy Ga-Shu Leung
- Writers: Charles Tang
- Language: Mandarin | Cantonese
- Stars: Chun-Pui Chan , Ka Wai Cheng , Ying-Hao Cheng , Roy Chiao , Sze-Man Ho , Chih-Kuang Huang , Tam Tin-Nam , Siu-Ming To , Man-Yee Tse , Su-sei Wong
- Runtime: min
- Awards: N/A
- AKA: Xiao xiao shi jie (Hong Kong) , 123 Do-Re-Me (Hong Kong) , Yi er san , 123 (Hong Kong) , Yat yee sam (Hong Kong) , Do-Re-Me (Hong Kong)
- Plot: N/A
- IMDB:tt2148838
Yi er san Cast
Tommy Ga-Shu Leung
Director
Chun-Pui Chan
Ka Wai Cheng
Ying-Hao Cheng
Roy Chiao
Sze-Man Ho
Chih-Kuang Huang
Tam Tin-Nam
Siu-Ming To
Man-Yee Tse
Su-sei Wong