Also known as Third Brother, a thirteen-year-old boy who has suffered from insomnia for seven years and is typically proud, aloof, and quiet. He reluctantly takes on babysitting duties for Wanwan, finding her constant questions exhausting. Despite his initial frustration, he shows care by helping her dress and sharing sleep with her, which finally allows him to rest. He has obsessive-compulsive tendencies and is somewhat gruff but softens around Wanwan.
