Three years ago in Spain, Chaewon had to break up with her boyfriend, Seongjun Han, because her father collapsed after his company went bankrupt. In order to pay the debt her father owes to his former employees and loan sharks, she decides to take part in a posthumous marriage for 200 million won. As a condition for the marriage, she's not allowed to date anyone for 1,000 days. On her wedding day, she runs into Seongjun, who still has feelings for her, and now she has to work part-time at his company for three months.