When Chu Yu was ten years old, Gu Sucheng moved to the door opposite her house. Gradually, she got to know this taciturn and even somewhat indifferent boy. In this way, Gu Sucheng stayed with her for twenty years from the age of ten to twenty, and from twenty to thirty. Chu Yu still didn't understand why. It wasn't until the moment he left that she realized that he had always loved her.