There is an old proverb saying, “An evil may sometimes turn out to be a blessing in disguise.” It means tragedy could bring a reversal at the end. Just like the case of ugly duckling, which turned out to be a beautiful swan, there are always ups and downs in life and everything just goes through after all… This drama brings you the story of Jae-in and Young-gwang. Warm-hearted Yoon Jae-in is a cheery, bright girl who always maintains a positive attitude despite her poor background. Kim Younggwang, former 4th hitter of the major league team, now a minor leaguer, is an innocently confident man who never stops trying his best to re-live past glories. This drama will show you how these young adults deal with life’s hardship and grow older to achieve their dreams.

Ha Na and Doo Na were twin sisters who were very close to each other until Doo Na died a terrible death. One day, the usually bright and energetic Ha Na finds herself changing. She has superhuman strength and can do things that nobody can. Ha Na realizes that Doo Na's spirit has inhabited her body.

married Jung In but on their wedding day she was forced to go to Shimyang. After being held captive, she escapes from the enemies and returns to her hometown only to be ignored by her in-laws. Her mother-in-law fabricates a lie saying that Soo Yeon's carrying another man's child in order to throw Soo Yeon out of the house. Soo Yeon returns home only to be poisoned by her illegitimate half-brother and mistress. Soo Yeon and her sister-in-law become vengeful ghosts and seek revenge by seducing men and then killing them. Jung In has become a royal inspector who is assigned to find out the cause of the men's mysterious deaths. However, on the mountain ridge where all these deaths occurred, he sees the ghost of Soo Yeon...