Han Cheng is Xi Yang's friend and roommate, sleeping on the lower bunk. He is described as fat. After Xi Yang is beaten, Han Cheng hides Xi Yang's phone to keep it safe. He initially lies to Teacher Liu about the incident under pressure from Zeng Xing. Later, he confesses to Xi Yang and shares his family's financial crisis: his father lost money in stone gambling and now faces ruin. He becomes a confidant to Xi Yang, who promises to help him through stone gambling. Han Cheng is loyal but fearful, caught between his conscience and the threat of bullies.
