- Country: South Korea
- Genres: Comedy, Drama
- Release: 2020-09-02 (South Korea)
- Director: Se-kyo Jung
- Writers: Soo-Jin Kim
- Language: Korean
- Stars: Bae-soo Jeon , Bo-Jung Kim , Bon-gin Goo , Hee-joon Lee , Hyeon-bae Dong , Seong-Gyoo Jeong , Jeong-yeong Kim , Ji-Young Park , Jin-woo Park , Na Moon-hee
- Runtime: 109 min
- Awards: N/A
- AKA: Oh! My Gran (United Kingdom) , 名偵探奶奶 (Taiwan) , Oh! My Gran (United States of America) , Oh! My Gran (India) , Oh! My Gran , 哦!文姬 (China) , Oh! My Gran (Canada) , O! Moon-hee (Korea) , O! Moon-hee 哦!文姬 (China), 哦!文姬 (South Korea)
- Plot: In her mind, Moon-hee is 'Secret Jouju', the princess in TV animation. In reality, Moon-hee is a granny with Alzheimer's disease cared by her son, Du-won and the grand-daughter, Bo-mi. On one secret night-out with Bo-mi, Bo-mi gets a hit-and-run accident. Moon-hee is the only witness, but she rather mumbles the nonsense. Bo-mi stays in a coma and the police can't help. Now Du-won has to track down that culprit with a few pieces of the vehicle and his mother's might-be-meaningful gibberish.
- IMDB:tt13148808
Oh! My Gran Cast · · · ALL
Se-kyo Jung
Director
Na Moon-hee
Moon-hee
Lee Hee-jun
Du-won
Choi Wonyoung
Detective Kang
Ji-Young Park
Director Song
Bae-soo Jeon
Mr. Han
Sun-kyung Kim
Kim Jung-young
Hak-sun Kim