Ah-jung's nose bleeding during consensual sex, is true. Feeling guilty, she visits Jong-pal, who is even more intellectually disabled than her son, and cries for him when she hears he does not have a mother to fight for him, knowing he is going to jail for a crime he did not commit. Do-joon is freed from prison and Jin-tae picks him up. They pass the collector's burned-down house on the way home and stop to pick through the rubble. During dinner, Do-joon muses to his mother that Jong-pal probably dragged Ah-jung up to the roof so that someone would see she was hurt and help her. As the mother is about to depart from a bus station on a "Thank-You Parents" tour, Do-joon returns her acupuncture kit, which he found in the remains of the junk collector's house, and tells her to be more careful. Jarred by his discovery, she sits on the bus in shock before using the kit to blank out the memory of her son's guilty crime. Cast Kim Hye-ja as Mother, an unnamed widow who is extremely protective of her son and attempts to free him from a murder charge Won Bin as Yoon Do-joon, the adult son of Mother, who has an intellectual disability and is accused of the murder of a local girl Jin Goo as Jin-tae, a local ne'er do well and one of Do-joon's friends. He bosses Do-joon around, but agrees to help Mother free her son. Yoon Je-moon as Je-moon, the detective in charge of Ah-jung's murder case Jeon Mi-seon as Mi-seon, a camera-shop worker who helps Mother. She had met Ah-jung before she died. Song Sae-byeok as a detective Lee Young-suk as the junk collector Moon Hee-ra as Moon Ah-jung, a young girl who is murdered, leading the police to arrest Do-joon Chun Woo-hee as Mi-na, Jin-tae's girlfriend Kim Byung-Soon as the detective team leader Yeo Moo-Young as Do-joon's lawyer Lee Mi-do as Hyung-teo, Ah-jung's friend Kim Jin-goo as Ah-jung's grandma Lee Jung-eun as Ah-jung's relative with glasses Hwang Young-hee as Ah-jung's pregnant relative Kwak Do-won as charcoal fire man Ko Kyu-pil as Ddong Ddong Release Mother competed in the Un Certain Regard category at the 2009 Cannes Film Festival. In South Korea, it attracted 3,003,785 admissions nationwide and grossed a total of , becoming the 6th most-attended domestic film of 2009, and 10th overall. The film had its U.S.