The song was written in Da Nang in the summer of 2018 when Ly returned to visit her parents. Ly's song often refers to her mother, and this one too. Memories of the smile of his mother in the thirteen and 14 year old years are still vivid in Ly's mind. The smile was very sad but beautiful, and at that time there was no social network, there was no need to take photos to share so there was no "FB smile". Li remembered all the smiles of his family and friends at that time. And basically that childhood, though not affluent, but sadness and joy are so natural the way it is.