Main characters: 

• Lee Gikwang
• Yoon Doojoon
• Yong Junhyung
• Yang Yoseob
• Son Dongwoon
• Jang Hyunseung
• Gigi Yong
• Luna Yong

Lee Gikwang

19.A new student who comes from Gwangju moves into a new university, Jung Ahn University. Really friendly towards people, sweet and caring when it comes to love and also fierce when it comes to fights and argues. Once he moves into the school, the popular group, B2ST which consists of Yoon Doojoon, Yong Junhyung, Yang Yoseob, Son Dongwoon and Jang Hyunseung, gets to be friends with him. Will everything between their friendship will be smooth? Let's just find out....

​Yoon Doojoon

20. The leader of B2ST. His eyes can melt almost every single girl's heart. Caring, kind and also sweet when it comes to his crush, Gigi Yong. He has been liking her since high school. His goal is to be with Gigi together, he forces his friends to make a way to make them together. He is fierce towards the boys when they don't make them together. Will Gigi like him back? Will they be together? Or she'll fall in love with the new student? Let's find out.

Yong Junhyung

19. Gigi's twin brother and also Luna's cousin. Comes from Australia. He's the joker in the group, the one who makes people laugh wildly. Takes care and loves Gigi with all his heart, there was a time when Gigi was left alone back in Australia's home, she got scared and when Junhyung got back home, she hugged him tightly while sobbing. Since then, he became different, from the cold hearted to the warm and caring hearted. But one thing he always worried about was, will he be able to make both Doojoon and Gigi together? What is Gigi doesn't like him? And he'll be injured with bruises all over his face by the leader? Let's all find out.

Yang Yoseob

19. In a relationship with Luna Yong, loves her with all his heart and never lets her down. He always does aegyos when his girlfriend, Luna won't buy him his favorite snacks or not satisfied with him. Can instantly make girls smile when he does some aegyos. But he also worries, what if he didn't make his leader's dream to come true? Will he be in trouble? Let's find out!

Son Dongwoon

19. A hyper and cheerful guy who hates skinships really much! He doesn't like to be in a relationship cause he knows that it's suffering when either one of them cheats. He's sweet towards girl but when a girl confessed or asked him to accept her, he'll feel disgusted or he'll ignore that person for weeks, months or even the rest of his life. He doesn't worry when it comes to his leader, because he knows that if Doojoon's wish doesn't come true, Doojoon will be the one who scolds Junhyung. The leader's aim is only at Junhyung since Gigi and he are twins. Will the thing he doesn't worry becomes true? Let's find out. 

Jang Hyunseung

20. A 4D guy who lives in a normal world. He's really in love with food! Just after a few hours he ate, he'll become hungry again. When it comes to love, he doesn't care at all. He's 4D, oh come on! A 4D guy won't fall in love with normal girls! To be serious, he really doesn't like to be in a relationship too, just like Dongwoon. But all he thinks is, the leader won't be mad at him because he isn't really that interested in love. But will what Hyunseung thinks is real? Let's find out...

Gigi Yong

19. Junhyung's twin sister, she always acts lovey-dovey with him. Some people who doesn't know them, thinks that they're couples. They always hug, snuggled or even cuddled! But to be honest, they really love each other, they care for each other, and that's what a family is right? She's also really attracted to more muscular guys. She always teases Luna with Yoseob, but Luna doesn't care. She's really in love with that boy! But, will she find out that Doojoon has feelings and loves her? Will she like him back if she finds out? Let's all find out together!

Luna Yong

19. Yoseob's one and only girl, she's a kind and also sweet person. She takes care both Junhyung and Gigi really well in their university's hostel since she's the oldest. She is a really good cook and also really good in attracting guys. Since always Junhyung is so worried and stressed with Doojoon, will she be able to find out that Doojoon loves her? Let's all find out.