Single man David (Mark Ruffalo) decides to rent out his apartment to forget his sad story. Strange things begin to happen: a girl named Elizabeth (Reese Witherspoon) breaks into David's life, claiming that this is her house. Elizabeth seems to have extraordinary abilities. She can appear in various places at any time, pestering David to force him to move out. However, she doesn't know that there is a cruel fact hidden behind this-in fact, Elizabeth is just a ghost. She was a workaholic and died in a car accident. David invited a ghost exorcist, and Elizabeth gradually knew her identity. In this process, David and Elizabeth developed a love between a human and a ghost. Elizabeth had a missed fate with David before her death, and this fruitless love affair seemed even more sad.