Kim Myungsoo, 20 yrs of age is a 3rd yr college student major in business management . He is the youngest son of the owners of IFNT corp. One of the largest and well known corporations in Asia. Despite living a very luxurious and comfortable life, his personality was somehow unexpected. He is quite stubborn and manipulative despite his handsome features. 

Lee Sungyeol, 20 yrs old. 3rd yr college student major in Managerial accounting. Son of a coffeeshop owner and a former school teacher. Persistent, intelligent, shy and humorous. That is how sungyeol was known for not only in their neighborhood but also in their university. However, being the smart guy he is, he stands for his opinions so much that sometimes ending up to serious arguments and such. 

Kim Sunggyu, 21 y/o Myungsoo's older brother. Senior college student majoring in Business management. The heir of the Kim family's company. Opposite to myungsoo, sunggyu is a well mannered guy, wise and patient. He is close to Myungsoo but sometimes the younger was too unpredictable and stubborn because their parents always compare Myungsoo to him. 

Nam Woohyun, 20 y/o Lee Sungyeol's best friend. 3rd yr college student major in Business management. They met during middle school because they were seatmates at that time. Contrary to Sungyeol, Woohyun is very friendly to others. Optimistic, talkative, sporty and quite sensitive were some of the things to describe him. 

Jang Dongwoo, 21 y/o Kim Sunggyu's childhood friend. Classmate of Kim Sunggyu. He is also close to Myungsoo but the younger seldom hang out with him. A happy go lucky guy, talented and very nice & honest person are the things that Dongwoo was known for. 

Lee Sungjong, 20 y/o Lee Sungyeol's diva and sassy cousin. 3rd yr college student major in marketing. Although the two get along really well, sometimes Sungyeol got really embarrassed with Sungjong's actions and sarcastic comments abount literally anything. Sassy as he may seem, Sungjong was really warm and caring person.