Seo Jin-woo has a special condition called Hyperthymesia which allows him to remember almost every day in perfect detail. While his father, Seo Jae-hyuk on the other hand, developed an Alzheimer’s disease, making him lose his memories. When Seo Jae-hyuk was wrongfully convicted of murder, Jin-woo vows to prove innocence of his father. Four years later, Jin-woo becomes a lawyer to put the real criminal behind bars but bribery, corruption, and betrayals would not give him an easy road to justice.