Is a civil lawsuit possible against the makers of "Assassins"?

My mother was murdered by a psychopath, but they are making a commercial film based on a conspiracy theory that my father was actually the killer, raking in massive profits without the bereaved family's permission. Is it possible for the family to seek "financial treatment" by suing the director and production company for a return of revenue? If it reaches 3 million viewers, would filing a civil suit for around 30 billion KRW in revenue be appropriate?