L, an angel who’s endlessly fascinated with the human world, gets into trouble when she unthinkingly saves the life of Han Shi Yeong, a man who was meant to die. To make up for her mistake she must guard him on Earth for one hundred days and keep him safe from Hwan, a death god who is required to collect his soul. Both supernatural beings must contend with the knowledge that whichever one of them fails by the end of the hundred days will be erased from existence, and the longer they stay on Earth the further their powers fade and the more human they become.
Hoshino Midori has been worn down by the hectic pace of working at a cosmetic surgery clinic. But when the clinic suddenly goes bankrupt, she unexpectedly finds herself unemployed. Seeing her at a loss, her older brother, Konta, suggests she take a "vacation from life" by staying at the villa their late grandmother left behind. Awaiting Midori at the villa are a beautiful seaside view, a garden overflowing with ripe summer oranges, and a mysterious caretaker named Nishigami, whose otherworldly presence immediately stands out. Soon, her close friends Rinrin, Tsumugi, and Tetsuro also gather at the villa. With Nishigami's help, they settle into a fulfilling summer vacation, enjoying carefree days together. Yet as Nishigami quietly watches over them as the villa's caretaker, a trace of sadness occasionally crosses his face. What is the true reason he continues to protect this villa? As summer draws to a close, an approaching storm threatens to dramatically change both Midori's and Nishigami's destinies.
33-year old Han Je In is a mystery novelist who is notorious for habitual false reporting to the police in town. Her only friend is police officer Rok Hwan, who has had a crush on her since childhood. One day, Je In hears a scream of help from an apartment upstairs and reports that a serial killer lives above her but no one believes her. Convinced that Jason, the handsome man living upstairs, is a serial killer, she asks Rok Hwan to help follow him around with her. But as she learns more about Jason in her pursuit to uncover the truth, she begins to fall for him. Seeing her in this state, Rok Hwan feels a tinge of jealousy.
