Ho-bin, Min-woo, Byung-tae, and Young-min are members of the high school band National Road One and are also good friends. Unlike when they were young, their lives have become dull and boring as they have grown up. Min-woo finally decided to give up music and was determined to realize his dream of standing on the stage of a music festival when he was young for the last time. Ho-bin, who has been an unknown actor for 10 years, Young-min, who has aphasia due to the hurt of his first love, Byung-tae who wants to be in a band, and Donkey Xiaozhuang, together, started the last street performance trip of National Road One. Starting from Mokpo, South Jeolla Province, to Gapyeong, Gyeonggi Province, where the music festival is held, the four people made a blind decision to walk. How will their journey turn out...