Zhou Mingye's younger brother is a male minor character who appears in the family photograph at Zhou Mingye's home. He is depicted as a young boy standing in front of his mother in the photo. Ling Xi guesses he is Zhou Mingye's younger brother based on his appearance in the family portrait, though this is not explicitly confirmed in the text. He is not directly interacted with in the narrative and only appears as part of the family image that prompts Ling Xi's later discoveries about Zhou Mingye's family background. His presence in the photo adds depth to Zhou Mingye's family dynamics.