In Seoul, the Thai Pim is informed that her mother had a heart attack in her hometown. Pim travels with her boyfriend Wee to Thailand to give assistance to her mother. Once in her home, Pim is haunted by her Siamese sister Ploy that died in the surgery of separation when they were teenagers. Wee asks his old friend and psychologist to have sessions with Pim to supersede the trauma of her loss. But when Pim's mother is able to speak to Wee, she discloses dark secrets from the past of the twin sisters.