Its distributor said the film, released on May 15, surpassed the 3-million viewers mark as of Wednesday.
The film is about a strange alliance between a gang leader and a young detective as they try to hunt down a serial killer.
It was screened at this year's Cannes Film Festival which wrapped last week.
A Hollywood remake is already in the works by Balboa Productions, led by Sylvester Stallone.
"The Gangster, The Cop, The Devil" is directed by Lee Won-tae, and features Ma Dong-seok, Kim Moo-yul, Kim Sung-gyu, Yoo Seung-mok, Choi Min-chul, Kim Yoon-sung. Release date in Korea: 2019/05/15.
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