Lee Jung-In is a librarian who has been in a 4 year relationship with a banker Kwon Gi-Seok. Yoo Ji-ho is a Pharmacist and single dad who graduated a year behind Kwon Gi-Seok from the same University. After a chance meeting at his pharmacy, Ji-ho and Lee Jung-In start seeing love and relationships in a new light. Lee Jung-In meets Yoo Ji-Ho at the pharmacy when she goes there to remedy her hangover.