The film has attracted some two million viewers since it was first screened on Feb. 14.
"US distributors show keen interest in distribution or remake rights," Showbox added.
The movie is based on Yoo Young-Chul who murdered 21 people - mostly masseuses - between September 2003 and July 2004. Yoo was reportedly caught by pimps who noticed that several girls disappeared after responding to calls from a particular number.
It is directed by Na Hong-Jin, who made his name with award-winning shorts but had never made a commercial feature before.
The director of Oscar-winning French biopic La Vie en Rose said he would start work straight away on his next film, which is to be set in southern and Midwestern US and feature a star-studded American cast.
"I recently wrote my next film and I am leaving on a location shoot on Wednesday," Olivier Dahan said.
Speaking from Los Angeles, Dahan said the movie was "a surrealist drama set between Kansas and Louisiana," and would star Forrest Whitaker and "perhaps Sharon Stone."
An Oscar win "gives me access to all the actors I want today, and that's a good thing," he said.
RSS