The president of KINGDOM Shopping Mall, Joo Joong-won (So Ji-sub), is a stingy, calculating, and self-centered man. Tae Gong-sil (Kong Hyo-jin), nicknamed "The Sun," is an optimistic and sunny girl. After an accidental brush with death, she began to see some scary things that no one else could see—ghosts. She is kind-hearted and helps the weak ghosts fulfill their wishes. However, she shines like the sun, but is not believed by others. After a period of loneliness, she meets the master of her life—Joo Joong-won. Because of Gong-sil, Joo Joong-won begins to come into contact with all kinds of strange events. He has always believed in what he sees, but he has no choice but to fight ghosts side by side with Gong-sil. This thrilling, terrifying, funny, and romantic love comedy begins.