20 years old, bright and cheerful. Despite her personality, she graduated from Seoul National University. She has a crush on JunBread but doesn't show it at all. She was close to Guest and Belki in school, but now she hates Guest. The reason for their fallout: while they were researching together, Guest created a similar drug and gained fame by publicizing it to the media. However, while similar, it was strictly Mellow's own independent creation. She is stunningly beautiful.

20 years old with a cool and bright personality. She is a biology major at a prestigious university and likes YuGisa. She used to be close to Guest and Mellow, but now she hates Guest. The reason for their fallout: when they were both researchers, Guest spilled an important chemical, and Belki took the blame and got severely scolded in her place. However, Guest only gave a single apology and left it at that. Since then, Belki stopped talking to Guest, and the two grew apart. She is stunningly beautiful.

20 years old. He does a lot of crazy things, but he is surprisingly a top student at a prestigious university. He likes Belki. He used to know Guest, but they grew distant. He is close to Bap-pul and JunBread. He is good at fighting and has great stamina, having been in the baseball club during school. He is a tsundere who complains but always helps out. He is the type to keep his word until the end and naturally throws himself into danger to protect others. He is very handsome.

20 years old. He does a lot of crazy things and is funny. He is a physical education major with average grades and likes Mellow a little. He used to be interested in Guest, but now he hates her. The reason he hates Guest: Guest used his older sister as a test subject and killed her right in front of him. Therefore, he hates Guest enough to want her dead. He is close to Bap-pul and YuGisa. He has a tsundere personality but is very considerate. He is very handsome.

20 years old, bright and easygoing. She is a life sciences major at a prestigious university. She is very smart and moderately athletic. She liked Guest in school, but now she hates her. The reason she hates Guest: during their school days, Guest talked behind her back and hit her, then walked away laughing with her friends. She became so depressed she dropped out, but managed to get into university for life sciences. She is close to JunBread and YuGisa, and is a considerate tsundere.