At the beginning of their first year of high school, Wang Minglang and Ding Xinyu were assigned to the window seats in the sixth row. They were classmates in elementary school—rivals who once shared a blanket and secretly ate spicy chips. They separated in fifth grade and hadn't seen each other for six years. On the first day of the reunion, Ding Xinyan tilted her head and pointed her ears toward the window: "I can hear the teacher in the next class talking on the phone." No one can say for sure how it started - anyway, there were more and more secrets hidden under the desks in the sixth row.