"Jung-Won"; it is instead the real name of Mi-Ja. She fabricated the story about her life: she was the one who was poor, obese, broke her leg after doing Ms. Park's punishment, and defecated in the class. Her mother was handicapped during the car accident and died when she was an adult. Jung-Won then took the identity of Mi-Ja and became Ms. Park's caretaker until she could kill her classmates at the reunion. Jung-Won drives Ms. Park to the beach and vents her frustration at her before committing suicide by jumping from the pier, while Ms. Park can only watch. The film closes with Ms. Park's wheelchair lying empty on the pier. Cast Oh Mi-hee as Ms. Park, the old teacher dying of an illness and is resented by the other characters. In her eyes she thought she was doing what was best for them. Seo Young-hee as Mi-Ja/Jung-Won, the only student who doesn't resent Ms. Park and works as her caretaker. Mi-Ja and Ms. Park share a special bond. Lee Ji-Hyun as Sun-Hee, was once obese and teased by Ms. Park but then became skinny and obsessed with her appearance and weight. She has to wear sunglasses to hide the stitches from a recent eye surgery. Lee Dong-kyu as Myung-Ho, a boy who was always favoured by Mrs Park. It is hinted that she made sexual contact with him that has left him scarred for life. Yu Seol-ah as Eun-Young, the class vice president whose family was to be poor. For a present, she made her a card that said "I love you Ms. Park". Ms. Park then ridiculed her in front of the entire class. Park Hyo-jun as Dal-Bong, used to be the most athletic boy in school. After he came last in a relay, Ms. Park slapped him and made him spend a day doing squats, which later caused him to permanently injure his knee when playing soccer the next day. Yeo Hyun-soo as Se-Ho, the former class president who was close to Eun-Young. Ms. Park bullied him for being poor. He is the first to tell Ms. Park how he feels in a drunken rage. Jang Seong-won as "Jung-Won", the shy boy that no one used to talk to. He apparently "pooped his pants" during lesson once and the entire class laughed at him including Ms. Park. His mother was then severely injured in a car