Eun-ho, a free-spirited gumiho, avoids good deeds and romance to steer clear of becoming human. Her carefree life takes an unexpected turn after a fateful encounter with a self-absorbed soccer star.

Little Seung-jae stays up all night and writes letters to So-hee, pretending to be her father in Mars. Leaving Seung-jae's innocent heart behind, So-hee leaves for a big city. Both grown up to be adults, Seung-jae is a postman who writes letters to So-hee's grandma - the letters that never came from So-hee. So-hee's heart hardens after hardships in life and she comes back to her hometown and Seung-jae's heart swells up again at seeing her again...

As events unfold, Cha Se-eum, an acclaimed female conductor who stands out among the mere 5% of women conductors globally, endeavors to reveal the truth surrounding the orchestra while safeguarding her own undisclosed secrets.

On a snowy night, little Seon-mi is diagnosed with hemopoietic dysplasia. Years pass and Seon-mi, who has now become an adult, has overcome her pain and is adjusting to the adult world. Having decided to use her talent to become a perfumer, she travels to many different places to collect various scents and spices to help people with their inner pains. She meets Sang-woo at an aquarium and is strongly drawn to his scent which reminds her of her father.

A young woman with a miserable life receives a magical book that gives her the power to make every man she encounters fall for her.