Gong Saejin is a high school senior at Gyungsan High School. At school, she isn't a smart student but she isn't a stupid one too. She's a slow learner. As a girl, Saejin is just your ordinary girl. She's an introvert, becomes shy when she speaks to the boys but a ball of sunshine when it comes to her bestfriends. 

Kim Jaehwan is a new student at Gyungsan High School, enrolling on the senior year because his family transferred to the city. He is extremely clever, although he always denies it. Everybody knows by the way, that he wants to claim the first ranking in his new school. 

Ong Seongwoo. He is another clever student in Gyungsan High. He dreams big, and always does things his own way. Sometimes, people might mistake him for being cocky but the truth is, he never intends to. 

Saejin's senior year will be surrounded by her friends and these two guys. One, she secretly admires. Another one, he secretly admires her. So what will happen when the boys start to show interest in her and make her hopes high? 

Between Seongwoo and Jaehwan, Saejin is not sure which one she would like to chooose. Perhaps, its too early.