Kim Aejeong | 17 
A high-schooler girl who studies in a private high school, Minhwan High School. She comes from a wealthy family; Where her father works as a successful policeman, her mother works as a worldwide fashion designer, her grandfather owns one of the biggest airport in the country, her grandmother works as an actress meanwhile her brother owns one of the biggest company in the country. She's the only person who knowledgeable in loves even if she doesn't get enough experiences to. Well, it's because of her name, which brings the meaning of love affection in Chinese language since her father's family is ancestry in Chinese family. She's one of the most cleverest, prettiest yet richest students in the private high school, but the problem is she's also one of the shy students in there. Many people want to befriend with her, but she only accepts some of them because she doesn't want to make her circle big. 

Kim Jinhwan | 22
A 22 years old man who comes from a wealthy family, but with a single father. His mother cheated on his father when he was around 13 years old, then his mother left them alone in the huge mansion, taking his older sister away from them with her. So, right now he's living with his father, or sometimes with his father's girlfriend too. His father works as a pilot meanwhile his father's girlfriend, which is going to be his upcoming-soon-mother, works as a doctor who owns one of the biggest hospital in the country. He's a romantic boy who is sometime a sassy boy too. Even if he has a baby face, actually he's a ert person. His eyes never get off from a y thing that appears in-front of him. He can stays a little bit longer with his recent broke-up-relationship, as long as he doesn't check out any other girls. He doesn't work now, he's just a trainee under his upcoming-soon-mother's hospital, about to be a doctor exactly like her. 

Song Yoonhyung (Yunhyeong) | 21
A 21 years old man who easily gets jealous. He's that type of person who easily gets jealous yet that person who likes to control his girlfriend's life. He also comes from a wealthy family; His father works as a headmaster, his mother works as a lawyer, his sister works as a model meanwhile Yunhyeong owns one of the biggest gym center in the country. He likes to go to his gym for checking out how well it goes and sometimes for working out too, just only if he has a free time. He puts a lot of efforts on a relationship, that's why he controls his girlfriend's life. He thinks that not letting his girlfriend being free is one of the right thing to do in a relationship, not until he got broke up by his girlfriend. In other reason, he want to know how it feels too for controlling someone's life since he can't controls any's life but he's the only one who got control by his family. So in the other reason, it's kind of he's wanting to take a revenge. 

Kim Jiwon (Bobby) | 21
A 21 years old man who never knows how to take in charge in a relationship. Of course he does falling in love or in a relationship before, but the problem is he's clueless when it's love. He doesn't know what should he does, he thinks that it's more better to date with his girlfriend in a place where all not-really-good-looking men hanging out on, he always want to be the person whom his girlfriend always looks and pays attention on. But because of his too selfish attitude and not that good in a relationship attitude, his girlfriend just broke up with him. He comes from a wealthy family; His father works as a surgeon, his mother is one of the popular director in the country meanwhile his older brother works as an orthodontist. His father and older brother works at Fairfax, ia meanwhile his mother works at Korea. So, that's mean he lives in Korea with his mother, meanwhile his father and older brother lives at the place where he used to raise in. He decides to help his mother, so he works as an actor, who is still a newbie in the acting world. 

Kim Hanbin (B.I) | 20
A 20 years old man who owns a five-star cafe shop. He even comes from a wealthy family; His father works as one of the most successful photographer in the country meanwhile his mother works as an obstetricians and gynecologist. He has a younger sister, whom younger than him 16 years. He never, never and never ever gets into a relationship. Even if he has a good looking face and money, but he never gets into a relationship. It's because he doesn't accept any girls who ask him out since he hasn't move on from his past. He used to have a crush on this one girl, but she just assumed him as a friend. Even if he gets into a relationship, he knows that he can't take serious in the relationship. So his problem is he still can't move on, even though it's already been 8 years. Many girls work at his cafe shop just because wanting to get close with him, but he just assumes them as his workers and does his own stuff even though those girls are pretty and rich. 

Kim Donghyuk | 19
A 19 years old boy who is still a mama boy. He is given a lot of loves and attentions from his mother since he's the only son in the family, so his step father does gives attentions and loves on Donghyuk too, but not as many as he gives on Donghyuk's younger sister. Donghyuk's younger sister, Cheonsa, is a 17 years old high-schooler girl. She studies in a private high school, Minhwa High School. For more clearler, Cheonsa and Aejeong is a schoolmate, who shares the same batch and school. But, Cheonsa and Aejeong is not friend since they both are in the different classes. He comes from a wealthy family; His step father owns one of the popular entertainment in the country meanwhile his mother works as a worldwide make up designer. He's just a boy who is in process in doing his own business. His problem in relationship is, he's still a mama boy even though he's already reached 19 years old. He'll ask his parent for permission before doing something, he'll ask his mother for advices and many, as long as it shows that he's a mama boy. 

Goo Junhoe | 19
A 19 years old boy who likes to show off. Yes, he is muscline but he isn't that muscline. Somehow, he likes to show off that he's strong, he's muscline, he's macho, he's brave even though he's not. He likes to make himself big, make long story short, he want people to be proud to have someone like him at their sides. But somehow, doing those type of things in a relationship is just making his girlfriend annoyed with his dreams, which is being a strong man even though he still isn't. He comes from a wealthy family; His father works as a ship captain, his mother works as a history postsecondary meanwhile his older sister works as a nurse under a big hospital. Even though he already finished his school, he doesn't have the urge neither to continue studying nor getting a job. Since his parent is strict, he just applied in a Science university in the country. 

Jung Chanwoo | 18
A 18 years old boy who is really rich. He comes from a really wealthy family; His father works as an anesthesiologist, his mother works as an internist meanwhile his older brother works as a pathologist. His grandfather owns one of the biggest hospital in the country meanwhile his grandmother owns one of the biggest clinic in the country. His uncle works as a neurologist, his uncle's wife works as an allergist, their son works as an urologist meanwhile their daughter works as an ophthalmologist. His other aunt works as a dermatologist, his aunt's husband works as a radiologist, their first son works as a psychiatrist meanwhile their second son works as a prosthodontist. Since all of his family's members are all working as doctors, the Jung family getting more rich and popular. So, that's why Chanwoo applied in a Science university too to continue his studies. His problem in a relationship is because he doesn't understand girls' feelings. He's more like a selfish boyfriend, who keeps showing off his money and telling how good he is.