Female, a freshman at A University in Room 416. She is from Jianghuai and arrived early, cleaning everyone's desks and chairs and taking mattresses out to sun. She is introverted by nature and considers herself the plainest among the four roommates, initially feeling insecure. Her name combines her parents' surnames—Cheng like Cheng Yaojin and Su like Suzhou. She is kind and hardworking.
