In the midst of investigating a serial murder case, detective Park Sang-kyu (Jin Yi-han) confiscates a clump of wild berries from a smuggler, suspecting that these colorless odorless berries are key to solving the mystery behind the murder.
The three main characters of this drama pose the question of what a "righteous life" is in the era of political and social turmoil of the late Joseon Dynasty, when progressive thinking and the Confucian social reform movement "Silhak" began penetrating into Joseon from the Qing Dynasty.