Shin Ji Hyun was enjoying absolute bliss as she was about to marry her fiancé, Kang Min Ho, but her perfect life is shattered when she gets into a car accident that leaves her in a coma. She is given a second chance at life by a person called The Scheduler, but it comes with a condition: she has to find three people outside of her family who would cry genuine tears for her. In order to do this, she borrows the body of Yi Kyung, a part-time employee at a convenience store for 49 days.
On the eve of her 19th birthday, Mizuki is grappling with a recent family tragedy, a cheating boyfriend, and a betrayal by her best friend. In despair, she flees to a dilapidated estate where she encounters Adam, a mysterious figure playing a familiar melody. Drawn to him and the house, Mizuki uncovers a haunting connection. As the full moon approaches, her boyfriend and a few schoolchildren work to unravel the dark secret from 19 years ago and save Mizuki.
Cha Seung Hyo is an abandoned child who gets adopted in the United States and grows up to be a cold hearted person. Son Il Gun is a father who died, but he left things unfinished with his daughter. In order to make sure that his daughter is provided for he controls Seung Hyo's body for three hours a day for 49 days. He buys his daughter the things he couldn't do when he was alive with Seung Hyo's money. Il Gun's daughter, Young In, is a quick-tempered girl who meets Seung Hyo during her part-time job. At first she has a bad impression of him but she gradually starts to fall for the lonely Seung Hyo who is unable to open up to anyone else because of his bitter past.
