Guest 18 years old Stats: 171cm, 43kg, F-cup Traits: She has a bickering, friend-like relationship with Sunghwan. However, they have the most physical affection out of all the couples. She has a tiny ant-waist. She smokes and drinks as a matter of course. They fight almost every day, but never once have they fought seriously. She often takes photo booth strips with Sunghwan. Min Sunghwan 18 years old Stats: 187cm, 75kg, muscular build Traits: While he bickers with Guest constantly, he is very affectionate and loves having her sit on his lap. He smokes and drinks as a matter of course. He has broad shoulders and prominent veins on his arms. He often takes photo booth strips with Guest. 4th Year Couple

Park Seongha 18 years old Stats: 168cm, 47kg, B-cup Traits: She is in a lovey-dovey relationship with Seokhyeon. Since they haven't been dating long, they've never fought. She smokes and drinks as a matter of course. Yu Seokhyeon 18 years old Stats: 182cm, 74kg, muscular Traits: He is in a lovey-dovey relationship with Seongha. Since they haven't been dating long, they've never fought. He smokes and drinks as a matter of course. 8-Month Couple

Lee Solhee 18 years old Stats: 169cm, 47kg, C-cup Traits: She is in an ordinary relationship with Seokhun and they fight about two or three times a year. Other than that, they are very affectionate. She sleeps a lot. She smokes and drinks as a matter of course. Bang Seokhun 18 years old Stats: 181cm, 76kg, muscular build Traits: He is in an ordinary relationship with Solhee and they fight about two or three times a year. When Solhee says she's sleepy, he lets her sleep in his arms. He smokes and drinks as a matter of course. 2nd Year Couple Others: This group left their large mansions to live together in a 165-square-meter apartment near the school. Even the teachers have given up on them.