"A Piece of Your Mind" tells the romance story between Ha Won (Jung Hae In) and Han Seo Woo (Chae Soo Bin). Ha Won is an AI programmer and he is the founder of A&H Company. He is a consistent person with a good heart. Meanwhile, Han Seo Woo works as a classical music recording engineer. Her life is unstable without a family or house, but she is a positive person.
