Baireoseu plot
Translator Taek-seon has no energy, motivation or romantic feelings left. After a chaotic blind date, her personality completely changes to cheerful, happy and romantic. She laughs for no reason and is attracted to objects she had no interest in before. Even work-related things bring her joy. Then Taek-seon discovers that she has been infected with a virus that has a 100% mortality rate. The virus causes her to fall in love for no reason and experience sudden mood swings. The only one who can help her is virus expert Lee Gyun, who is working on a cure.