Lin Senmu travels alone, expecting various unexpected events during the trip, but never expected that the strange girl on the soft sleeper upper berth would squeeze into his lower berth in the middle of the night. The girl talking in her sleep pulled Lin Senmu's arm to use as a pillow. Lin Senmu was speechless. Lin Senmu and Jiang Yuan got to know each other because of this. Both of them had just finished the college entrance examination and came on a solo trip. Since the destination station of their train tickets happened to be the same, they rented a recreational vehicle for a self-driving tour, during which their romance gradually grew.