When the crown prince is killed, his twin sister assumes the throne while trying to keep her identity and affection for her first love a royal secret.
Young-ho doesn't have any dreams for his life. He has been studying for three years to enter a university. He decides to send a letter to his childhood friend So-yeon. But her younger sister So-hee receives the letter instead of her sick sister. So-hee writes back to Young-ho, pretending to be So-yeon. Meanwhile, So-hee takes care of her sick sister and also runs a secondhand bookstore with her mother.
Burdened with visions of the future in their dreams, a young woman and two men try to prevent horrible events before they actually happen.
After being wrongly imprisoned for murdering her husband, a woman returns to the house where the incident occurred to solve the mystery of his death.
A star reporter, a second-rate journalist and a man by the code name "Healer" are brought together by a long-buried incident that hides dark truths.