Jong Du is autistic who ignores society's rules; unaware or unconcerned with the consequences of his actions. Unable to hold a job and always on the edge, he has been in jail three times: for attempted rape, for causing an accident while drunk, and for armed robbery. On the spur of the moment, he decides to visit and apologize to the family of the man killed by his brother. When he arrives, he finds a husband and wife moving out of their apartment, leaving the husband's seriously disabled sister, Gong Ju, for the neighbors to look after. Jong Du and Gong Ju slowly begin a friendship based on their mutual feelings of isolation. He provides her with the closeness she desperately needs; and she has found someone to care for, for the first time in her life. As their relationship becomes known, both their families are scandalized; and aided by the prejudices of society, transform the innocence of their love into something sick and twisted.