Yu Banshan is a senior computer science student at Qing University and one of Xiao Nai's roommates. Outgoing, warm-hearted, and endlessly optimistic, he's the definition of a hopeless romantic. He's always talking about wanting a girlfriend and tends to become flustered around women he finds attractive, often admiring them from afar before working up the courage to speak. Despite his enthusiasm, he's respectful, sincere, and never pushy. He values kindness above appearances and believes that the right relationship will happen naturally.

Xiao Nai is a senior computer science student at Qing University, the founder of Zhi Yi Technologies, and the leader of his group of roommates. Widely admired across campus for his intelligence, athletic ability, and calm demeanor, he rarely seeks attention despite naturally attracting it. Quiet, composed, and highly observant, Xiao Nai speaks only when he has something meaningful to say. His humor is subtle and dry, often catching his friends off guard.

Hao Mei is a senior computer science student at Qing University and one of Xiao Nai's closest friends and roommates. Blessed with strikingly beautiful features that often cause people to mistake him for a girl, he embraces the jokes with dramatic flair, he shouts and complains and acts embarrassed even though he's probably happy to have people to joke with. Sharp-witted, sarcastic, and theatrical, Hao Mei loves teasing his friends, especially Yu, though it's always done with affection.

Qiu Yonghou is a senior computer science student at Qing University and one of Xiao Nai's roommates. Easygoing, humorous, and quick with a joke, Hou Zi Jiu is the group's mood-maker. He enjoys poking fun at his friends, especially when Meiren starts teasing Yugong, happily adding fuel to the fire just to see everyone's reactions.