One stormy night, cleaning woman Gong-sil, who is haunted by ghosts, is picked up hitchhiking by greedy CEO Joong-won, an unwitting ghost repellent.
When a rumor circulates that the fountain inside of Kingdom's shopping mall is haunted by a female ghost, Joong-won must rely on Gong-sil's expertise.
The mystery of the mall ghost compounds when Gong-sil finds a shoe belonging to the dead wife of one of Kingdom's shop owners.
Joong-won agrees to let the fearful Gong-sil stay close to him, not yet realizing that another ghost has shown up at Kingdom.
A ghost matchmaker warns Gong-sil to be wary of ghosts who might want to manipulate her in order to return to the living.
As Gong-sil enjoys getting closer to Kang-woo, she worries that he will distance himself from her if he finds out that she can see ghosts.
When Joong-won's secretary stays home from work with a cold, Gong-sil is forced to step in and take her place for the day.
Joong-won finds out the real reason Kang-woo began to work for him, but Kang-woo vows to suppress the feelings that once motivated him.
Gong-sil shares her secret with Kang-woo; Joong-won saves Gong-sil when the spirit of a pianist's dead wife takes over her body.
Gong-sil warns Joong-won's haughty aunt that an evil spirit lurks inside the engagement present sent from her nephew's fiancee.
While attending his funeral, Gong Sil meets the ghost of Giant Mall's CEO, whose secret life as a cross-dresser is keeping him from eternal rest.
Gong-sil meets the ghost of a missing child whose mother is desperately searching for him; Joong-won and Gong-sil share a kiss.
After Joong-won appears before Gong-sil as a ghost, she begs the ghost matchmaker to help her find a way to save the man she loves.
Gong-sil starts a new job helping the ghost matchmaker; a hole in his memory causes Joong-won to feel a sense of loss he cannot explain.
The true identities of the twins are revealed; Gong-sil meets someone from her past; Yi-ryung finally gets her dinner date with Kang-woo.
The child ghost Woo-jin reappears and begs Gong-sil to save his grieving mother; Gong-sil and Joong-won struggle to go their separate ways.
Her journey of self-discovery complete, Gong-sil reunites with Joong-won in Korea and faces a heartrending decision about their romantic future.