The eldest brother of the Gu family, a soldier who joined the army at sixteen and served for ten years. He was recently carried home paralyzed and unable to walk. He has a pure Yin body, which makes him the perfect antidote for Ji Tangtang's pill poison. He is disciplined, restrained, and feels guilty after their encounter. He sends allowance home to support his siblings' education. Despite his condition, he is honorable and willing to take responsibility.
