Mother (2009)

Hye Ja (Kim Hye Ja) shares her home with her only son, Do Joon (Won Bin), a 28-year-old with a mental disability. He depends on his mother but tries to lead a normal life. His friend, Jin Tae (Jin Goo), often takes him out to bars.

One day, they arrange to meet for a drink outdoors, but Jin Tae doesn't show up. Left alone, Do Joon ends up drinking alone and returns home drunk. On the way home, he followed a girl and flirted with her but was rejected. Do Joon finally chose to go home.

The next day, there's shocking news saying that the girl Do Joon followed was found dead. The evidence and witnesses all seem to point to Do Joon. The police quickly arrest him and get him to sign a confession, even though he doesn't fully understand what's happening.

Hye Ja, firmly convinced of her son's innocence, makes every possible effort to prove his guilt and expose the real killer. Will Hye Ja's tireless efforts pay off? To uncover the truth, make sure you watch this neo-noir thriller directed by Bong Joon Ho!