Son Il-gun is a middle-aged deliveryman and devoted father to his daughter, Young-in. Young-in just graduated from high school and is an aspiring cartoonist, but she is working part-time instead of going to college due to financial difficulties, which the quick-tempered young woman partly blames on her "loser" father. She has no idea that Il-gun was once a struggling artist in his youth, but now that one of his paintings was sold for an exorbitant amount to a collector in New York, a local gallery offers Il-gun a solo exhibition. But before he can make a decision, Il-gun dies in a traffic accident, leaving Young-in penniless. According to Buddhism, the soul of a dead person is allowed to wander for 49 days in order to let go of all earthly attachments before going to the afterlife. But Il-gun loves his daughter so much that he takes it one step further, and possesses a stranger's body to care for Young-in and make it up to her.
Cha Seung-hyo was abandoned as a child, then adopted and raised in the United States. He is now a cold-hearted, perfectionist corporate raider without any meaningful relationships. However, after a traffic accident, he begins to lose time and wake up in strange situations, and he eventually learns that Il-gun is spiritually possessing him for three hours a day. Not only does Young-in find it suspicious that this stranger is suddenly concerned about her well-being, buying her expensive clothes and food, but Seung-hyo's subordinates also find it weird that he periodically acts out of character like a manically cheerful, old-fashioned man. Against his will, Seung-hyo gets drawn into Young-in's life, and discovers that Shin Jae-ha, owner of Nuri Art Gallery, is ingratiating himself with her, hoping to find more of the late Il-gun's paintings and buy them off her for less than they're worth. Young-in initially dislikes and mistrusts Seung-hyo, but the more she gets to know him, she glimpses his loneliness and gradually falls for him, which inevitably leads to awkwardness and hijinks.
