Two-way secret love, sweet exchanges between bad students and bad students, sweet articles from school uniforms to wedding dresses. Time is so long, I think, I slowly fall in love with you. During those nightmare years of tutoring, Zhao Minmin was like a lush creeper all over the wall, slowly taking over Wei Xingzhi's big bed, his desk, his snacks, his game console, his comic books, and his youth. When he turned back in a hurry, he realized that Zhao Minmin had become an inseparable person from him. It was Zhao Minmin who looked out for him when he was sleeping in class. When Zhao Minmin was injured by the corner of the table, he helped her apply medicine and bandage. They went to and from school together, sneaked to the Internet cafe to surf the Internet together, were yelled at by the teacher and made to stand outside the door, and together they were always tied for first or second in the grade list. In such boring and unforgettable youth years, they inadvertently filled the gaps in each other's lives that no one cared about, and became irreplaceable existences in each other's hearts.