Another angle: perhaps the user is referring to an Indonesian film. But that's less likely given the title. I should verify if there's an Indonesian film with similar themes. If not, proceed under the assumption it's the South Korean one. Also, check if there are any common Indonesian translations of titles that might cause confusion.
Be aware that several other titles share this name, which might affect your search for the correct Indonesian subtitles: Lethal Seduction (TV Movie 2015) lethal seduction sub indo full
Also, considering that "sub indo" is a common term in communities where Indonesian subtitles are added to non-Indonesian content. So the user wants to watch the movie dubbed or subtitled in Indonesian. Legally, that might require certain platforms or purchasing the movie with subtitles. Another angle: perhaps the user is referring to