Adapted from Keigo Higashino's original novel of the same name, "The Convenience Store of Sorrow", it tells the story of a grocery store on a secluded street. As long as you write down your troubles and throw them into the letter slot of the roller shutter door in front of the store, you will get an answer in the milk box behind the store the next day. One night, three lost young people, Ajie, Xiaobo, and Tongtong, accidentally broke into the time tunnel. Unexpectedly, they opened the time tunnel from the first consultation letter they received from the past. In the process of replying and receiving letters, the past linked to the future. Qin Lang, who was hesitant about whether to stick to his musical dream, Haobo, who was hesitant about whether to leave his hometown with his family to escape debt, and Qingmei, who was hesitant about whether to give up her job as a dancer, all made choices based on their reply suggestions, found the direction of their hearts, and inadvertently connected everyone's lives. At the same time, the three young people also received answers to their own confusion.