ed out to prevent the births of deformed babies. Anna Kim (Kim Ho-jung) is one such tourist who arrives in the city having booked a tour with the Butterfly Travel Agency. Anna wishes to become infected with the virus in order to forget the painful memories of her abortion. Her "virus guide", Yuki (Kang Hye-jeong), is seven months pregnant and unwell, but needs the money to support herself and her unborn child. K (Jang Hyun-sung), their driver, is new to the agency and starting his first assignment. An orphan with no memory of his real family, he keeps an old photograph of himself as a child on the dashboard of his taxi; he picks up other passengers in the hopes that someone will recognize him, even though this is against agency policy. Ater meeting Yuki and K at the airport, Anna is taken straight to a number of virus exposure sites, but their early attempts at finding the virus are cut short by acid rain storms. Finding out about Yuki?s pregnancy and poor health, Anna requests a new guide. K, suspicious of Yuki?s behaviour, reports her to the authorities as a suspected lead poisoning victim. Nevertheless, after Yuki treats Anna for exposure to acid rain, a bond starts to develop between them, and the three spend some time together. Anna cooks a meal for Yuki, and in return Yuki reveals her collection of personal items from previous clients, memories she is safeguarding should those people ever wish to remember their past again. After Anna leaves, Yuki is taken away by the city authorities. Continuing without Yuki as a guide, K continues to drive Anna around the city. At first Anna is frustrated by K's efforts to learn about his own past, but they begin to understand each other as they spend more time together. One night, they are involved in a road accident and their taxi veers over the side of a bridge; Anna rescues K from the water below and manages to resuscitate him, though she later requires treatment herself. Having recovered from the accident and with her time in Korea drawing to a close, Anna begins to make arrangements for her return home. However, she decides to track down Yuki and uses the last of her money to buy her release. They resume their search for the virus, but are cut short once again when Yuki?s water breaks. Knowing that she will not survive the birth, Anna urges Yuki to put her own health first, though Yuki is adamant that she will have the baby. Unable to reach the hospital in time, Anna fulfils Yuki?s wish to have a water birth, and, assisted by K, takes her down to the beach where she delivers the baby in the sea. Yuki later dies in hospital. As Anna and K search through Yuki?s belongings, they discover an old passport with Anna?s photo in it, suggesting that this is not the first time she has been to the city in search of the virus. Having no memory of such a visit, Anna goes to the Butterfly Travel Agency headquarters where she demands answers, but as she has signed a waiver they refuse to divulge any information. Later, she tells K how she wanted to adopt Yuki?s son in order to make a fresh start, but that she knows he needs the child more than she does. Three years later, K is still working as a driver for the agency. No longer searching for answers to his past, he now keeps a photograph of Anna in his taxi, along with one of him and his adopted son.

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