Evan Hansen is an ordinary schoolboy. He is afraid of people and suffers from social anxiety disorder. To cope with his illness, he writes letters to himself. One day one of these letters falls into the hands of Conor, a popular guy from a neighboring class. Soon after, Conor dies and his parents discover a piece of paper with the message "Dear Evan Hansen". From this moment on, Evan’s life changes dramatically: from being invisible, he turns into the best friend of the deceased and the object of heated discussions. There's just one problem: they were never friends. How far will he go in search of someone else's love?