In "Grey Castle", the heroine Xiao Wen experiences the flower season and the rainy season, and also falls into the fairy tale of the years and waves to her childhood self. Those people and things accompanied Xiao Wen as she lived in a big village called Youth, and spent her high school life painted in gray and color. Reunion, parting, smiles, tears, youth is not gone, you still have that warm boy, let us grow together.