South Korean film "Miracle in Cell No. 7" has been seen by more than 9 million people since its release 27 days ago, becoming the movie that saw its ticket sale grow at the fastest pace among all films that opened in 2012 and this year, according to industry sources.

The comedy topped the local box-office Monday, selling over 9 million tickets at local theaters. The film attracted some 7 million viewers only 20 days after opening.

Directed by Lee Hwan-Kyung, the film is about a group of inmates in cell No. 7 who embark on a mission to help a new inmate -- a mentally disabled man with a mind of a six-year-old child -- be with his seven-year-old daughter who he is single-handedly raising.

The movie may surpass the 10-million milestone this weekend as an average 200,000 tickets are sold on a daily basis, according to sources.

South Korea has a population of 50 million. (Yonhap News)