The series revolves around the narcissistic Lee Young Joon, the Vice Chairman of a company run by his family. He is very self-absorbed and thinks highly of himself, so much that he barely acknowledges the people around him. Lee Young Joon has a capable and patient secretary in Kim Mi So who has remained by his side and worked diligently for 9 years without any romantic involvement. However, Mi So now want to set her life and focus on herself so when she decides to resign from her job, hilarious misunderstandings ensue. After 9 years of their strictly-workplace relationship, can it now develop in something more?