Lu Yiran and Su Qianchen's love since high school broke up due to Mino's intrusion. Helpless Lu Yiran had to let go, but he was still unwilling to accept it. As everyone grew up, a group of friends in high school began to fall apart, deceit, hatred, and love. . . Everything was entangled, and finally everyone left this small town full of memories. The train took away everyone, and only Lu Yiran stayed there to guard their memories and the past that they could not go back to.