Lee Jung-In (Han Ji-Min) decides to prioritize happiness in her life. She works as a librarian. Her longtime boyfriend is Kwon Ki-Seok (Kim Joon-Han). He has impressive credentials like a good job as a department head at a bank, wealthy family, handsome and smart. Lee Jung-In meets Yoo Ji-Ho (Jung Hae-In). He is a pharmacist and a single dad. They fall in love.