Years after filming a viral documentary in high school, two bickering ex-lovers get pulled back in front of the camera — and into each other's lives.

The Hotel Del Luna, located in Seoul, is not like any other hotel: its client are all ghosts. Jang Man-Wol, stuck in the hotel for the past millennium, meets Koo Chan-Sung, the new manager.

What happens when an encounter between a man and woman who seem to have nothing in common develops into a complicated love story? Cha Soo Hyun is a woman and daughter of a politician who lives a life where she is unable to choose her own path. After graduating from college, she entered into a loveless marriage with the son to a wealthy conglomerate, a marriage only beneficial to her politican father. After having a child, she was obliged to divorce. Her life is changed when she meets simple and kind Kim Jin Hyuk. Kim Jin Hyuk is ordinary and innocent, a young man who enjoys life and finds happiness in the smaller things. He works various part-time jobs to earn a living, but is looking for a regular job. One day, he decides to take a trip abroad, where he meets Cha Soo Hyun.

Two best friends, So-yool and Yeon-hee, dream of becoming the top artists in Seoul together. But their friendship doesn't last long as Yoon-woo, So-yool's first love and songwriter, falls in love with Yeon-hee and her voice. So-yool's feeling of jealousy and inferiority towards Yeon-hee grows by the day, and she eventually makes a drastic decision to bring the two lovers down.