Director Quentin Tarantino named it, along with Bong's The Host, as one of his Top 20 favorite movies since 1992 This excellent movie (who ages really well like wine:) must have inspired this drama's author in a way It is even said that Signal is the Tv adaptation of Memories of Murder This film deals with the Gyeonggi serial rape and murder case that detectives invistigate on the first 4 episodes of Signal This movie has an amazing cast (Song Kang-HO is brilliant!) and cinematography The rest of the cast is keeping up brilliantly and the ending leaves you speechless The real life case, apparently and sadly the first serial killing case reported in Korea's history was never solved and reached a statue of limitation in 2006 unlike in Signal
Both are thriller movies by Bong Joon Ho that show violent detectives that are abusive during interrigation, feature a character with a disability (in Mother its the mc and in Memories of Murder a side character) who is accused of being the murderer of (a) girl(s). They leave you guessing till the end.