“A Piece of Your Mind” tells the romance story between Moon Ha-Won (Jung Hae-In) and Han Seo-Woo (Chae Soo-Bin). Ha Won is an AI programmer and he is the founder of M&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.