A captain in the military (referred to as Captain Gu throughout the text). Also transliterated as Gu Yunchi and Gu Xunche in different parts of the text. He has deep feelings for Mu Cheng but struggles with his identity and duties. He initially showed bias toward Bai Lin but is now questioning this after Mu Cheng confronted him about it being bias rather than misunderstanding. He comes from a family where his father died on a mission with Bai Lin's father. He is described as taciturn but shows vulnerability and flustered moments around Mu Cheng, described as a 'moving ice mountain fleeing in panic.' He brought Mu Cheng a gift of two porcelain kittens but claimed he needed help finding a box for them. He is conflicted between his feelings for Mu Cheng and his promise to his father to take care of Bai Lin. He reprimanded Bai Lin for her behavior toward Mu Cheng and plans to have his parents keep an eye on her.
