High school student Park Soo-ha (Lee Jong-suk) can read other people's hearts by looking at their eyes. This ability stems from a car accident murder case ten years ago. When Park Soo-ha was young, he and his father were hit by a large truck, and the truck driver actually wanted to kill him. Park Soo-ha witnessed the driver killing his father, but because he was too young to testify, Zhang Huixing (Lee Bo-young), one of the eyewitnesses, bravely came forward to testify. As time passed, Zhang Huixing became a public lawyer, but she always regretted the choice she made that year. As an adult, Park Soo-ha has been looking for the sister who bravely testified that year and vowed to protect her well. Later, a student fell from a building in the school, and Park Soo-ha met Zhang Huixing again, but he found that she was very different from the image of the righteous and kind lawyer he imagined. Will Park Soo-ha leave disappointed? The story of a super-powered boy with mind reading and a public lawyer begins.