A Prince who is the owner of the adjacent Prince's Estate and Mu Jianxi's neighbor. He is notoriously picky about food, often only taking a few bites before stopping or not eating at all, having replaced cooks batch after batch without satisfaction. He wears a dark profound long robe with a white jade girdle and exudes a noble yet awe-inspiring regal air. He is described as having a cold demeanor. He became extremely interested in Mu Jianxi's cooking after smelling it. He introduced himself as Gu Ruizhe, named from the lines 'Pre-knowing the Ruize reaches far, the blue sea is waveless and clear as mirror.' He ate two bowls of rice with her dishes despite his usual fussiness.
